Add docs outline with Antora skeleton

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.