Add docs outline with Antora skeleton

Closes gh-554

docs/.gitignore

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+package-lock.json
+node_modules

docs/antora.yml

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+name: reference
+version: 0.2.2
+prerelease: '-SNAPSHOT'
+
+title: Spring Authorization Server
+display_version: latest
+start_page: ROOT:index.adoc
+nav:
+  - modules/ROOT/nav.adoc
+  - modules/guides/nav.adoc
+  - modules/appendix/nav.adoc

docs/local-antora-playbook.yml

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+site:
+  title: Spring Authorization Server
+  url: https://docs.spring.io/spring-authorization-server
+  start_page: reference::index.adoc
+asciidoc:
+  attributes:
+    page-pagination: true
+content:
+  sources:
+    - url: ../
+      branches: [guides]
+      start_path: docs
+ui:
+  bundle:
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/latest/ui-bundle.zip
+    snapshot: true

docs/modules/ROOT/nav.adoc

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+.xref:index.adoc[Reference Manual]
+* xref:overview.adoc[Overview]
+* xref:getting-help.adoc[Getting Help]
+* xref:getting-started.adoc[Getting Started]
+* xref:configuration-model.adoc[Configuration Model]
+* xref:core-components.adoc[Core Components]
+* xref:protocol-endpoints.adoc[Protocol Endpoints]

docs/modules/ROOT/pages/configuration-model.adoc

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+= Configuration Model
+
+This page is under construction.
+
+[[oauth2-authorization-server-configurer]]
+== `OAuth2AuthorizationServerConfigurer`
+
+This section is under construction.
+
+[[oauth2-authorization-server-configuration]]
+== `OAuth2AuthorizationServerConfiguration`
+
+This section is under construction.
+
+[[provider-settings]]
+== `ProviderSettings` / `ProviderContext`
+
+This section is under construction.

docs/modules/ROOT/pages/core-components.adoc

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+= Core Components
+
+This page is under construction.
+
+[[registered-client-repository]]
+== `RegisteredClientRepository` / `RegisteredClient`
+
+This section is under construction.
+
+[[oauth2-authorization-service]]
+== `OAuth2AuthorizationService` / `OAuth2Authorization`
+
+This section is under construction.
+
+[[oauth2-authorization-consent-service]]
+== `OAuth2AuthorizationConsentService` / `OAuth2AuthorizationConsent`
+
+This section is under construction.
+
+[[jwt-encoder]]
+== `JwtEncoder`
+
+This section is under construction.
+
+[[oauth2-token-customizer]]
+== `OAuth2TokenCustomizer` / `OAuth2TokenContext`
+
+This section is under construction.

docs/modules/ROOT/pages/getting-help.adoc

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+= Getting Help
+
+This page is under construction.

docs/modules/ROOT/pages/getting-started.adoc

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+= Getting Started
+
+This page is under construction.
+
+[[system-requirements]]
+== System Requirements
+
+This section is under construction.
+
+[[installing-spring-authorization-server]]
+== Installing Spring Authorization Server
+
+This section is under construction.
+
+[[developing-your-first-application]]
+== Developing Your First Spring Authorization Server Application
+
+This section is under construction.

docs/modules/ROOT/pages/index.adoc

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+= Reference Manual
+
+This page is under construction.

docs/modules/ROOT/pages/overview.adoc

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+= Overview
+
+This page is under construction.
+
+[[introducing-spring-authorization-server]]
+== Introducing Spring Authorization Server
+
+This section is under construction.
+
+[[feature-list]]
+== Feature List
+
+This section is under construction.

docs/modules/ROOT/pages/protocol-endpoints.adoc

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+= Protocol Endpoints
+
+This page is under construction.
+
+[[oauth2-authorization-endpoint]]
+== OAuth 2.0 Authorization Endpoint
+
+This section is under construction.
+
+[[oauth2-token-endpoint]]
+== OAuth 2.0 Token Endpoint
+
+This section is under construction.
+
+[[oauth2-token-introspection-endpoint]]
+== OAuth 2.0 Token Introspection Endpoint
+
+This section is under construction.
+
+[[oauth2-token-revocation-endpoint]]
+== OAuth 2.0 Token Revocation Endpoint
+
+This section is under construction.
+
+[[oauth2-authorization-server-metadata-endpoint]]
+== OAuth 2.0 Authorization Server Metadata Endpoint
+
+This section is under construction.
+
+[[jwk-set-endpoint]]
+== JWK Set Endpoint
+
+This section is under construction.
+
+[[openid-connect-provider-configuration-endpoint]]
+== OpenID Connect 1.0 Provider Configuration Endpoint
+
+This section is under construction.
+
+[[openid-connect-user-info-endpoint]]
+== OpenID Connect 1.0 UserInfo Endpoint
+
+This section is under construction.
+
+[[openid-connect-client-registration-endpoint]]
+== OpenID Connect 1.0 Client Registration Endpoint
+
+This section is under construction.

docs/modules/appendix/nav.adoc

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+* xref:index.adoc[Appendices]

docs/modules/appendix/pages/index.adoc

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+= Appendices
+
+This page is under construction.

docs/modules/guides/nav.adoc

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+.xref:index.adoc["How-to" Guides]
+* xref:page-1.adoc[Example 1]

docs/modules/guides/pages/index.adoc

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+= "How-to" Guides
+
+This page is under construction.
+
+== Table of contents
+
+** Obtain an access token using a specific grant_type:
+*** `authorization_code`
+*** `client_credentials`
+*** `refresh_token`
+** Customize form based login
+** Authenticate a user with two-factor authentication
+** Customize the user consent page
+** Authenticate using OpenID Connect 1.0 authorization_code flow
+** Customize the OpenID Connect 1.0 UserInfo response
+** Authenticate using social login, e.g. Google
+** Authenticate a user in a Single Page Application with PKCE
+** Customize client authentication for specific authentication methods
+** Handle errors and customize the OAuth 2.0 Error response
+** Authorize an access token containing custom authorities, e.g. roles, groups, permissions, etc.
+*** Customize the headers / claims in a JWT
+** Deny access for a revoked JWT access token
+*** Introspect / revoke an access token
+** Provide a JWK source backed by a key rotation strategy
+** Implement the core services with JPA:
+*** `RegisteredClientRepository`
+*** `OAuth2AuthorizationService`
+*** `OAuth2AuthorizationConsentService`

docs/modules/guides/pages/page-1.adoc

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+= Example 1

docs/package.json

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+{
+  "dependencies": {
+    "@antora/cli": "^3.0.0-alpha.8",
+    "@antora/site-generator-default": "^3.0.0-alpha.8"
+  }
+}