Remove Core API mentions from docs (#8780)

* remove coreapi generator mentions & hidden docs

* remove coreapi doc & redirect broken links to github snapshot

Author: tfranzel

docs/api-guide/filtering.md

@@ -335,15 +335,6 @@ Generic filters may also present an interface in the browsable API. To do so you
 
 The method should return a rendered HTML string.
 
-## Filtering & schemas
-
-You can also make the filter controls available to the schema autogeneration
-that REST framework provides, by implementing a `get_schema_fields()` method. This method should have the following signature:
-
-`get_schema_fields(self, view)`
-
-The method should return a list of `coreapi.Field` instances.
-
 # Third party packages
 
 The following third party packages provide additional filter implementations.

docs/api-guide/pagination.md

@@ -264,15 +264,6 @@ API responses for list endpoints will now include a `Link` header, instead of in
 
 *A custom pagination style, using the 'Link' header'*
 
-## Pagination & schemas
-
-You can also make the pagination controls available to the schema autogeneration
-that REST framework provides, by implementing a `get_schema_fields()` method. This method should have the following signature:
-
-`get_schema_fields(self, view)`
-
-The method should return a list of `coreapi.Field` instances.
-
 ---
 
 # HTML pagination controls

docs/community/3.10-announcement.md

@@ -142,6 +142,6 @@ continued development by **[signing up for a paid plan][funding]**.
 
 *Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Sentry](https://getsentry.com/welcome/), [Stream](https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf), [ESG](https://software.esg-usa.com/), [Rollbar](https://rollbar.com/?utm_source=django&utm_medium=sponsorship&utm_campaign=freetrial), [Cadre](https://cadre.com), [Kloudless](https://hubs.ly/H0f30Lf0), and [Lights On Software](https://lightsonsoftware.com).*
 
-[legacy-core-api-docs]:https://github.com/encode/django-rest-framework/blob/master/docs/coreapi/index.md
+[legacy-core-api-docs]:https://github.com/encode/django-rest-framework/blob/3.14.0/docs/coreapi/index.md
 [sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
 [funding]: funding.md

docs/community/3.4-announcement.md

@@ -187,7 +187,7 @@ The full set of itemized release notes [are available here][release-notes].
 [api-blueprint]: https://apiblueprint.org/
 [tut-7]: ../tutorial/7-schemas-and-client-libraries/
 [schema-generation]: ../api-guide/schemas/
-[api-clients]: ../topics/api-clients.md
+[api-clients]: https://github.com/encode/django-rest-framework/blob/3.14.0/docs/topics/api-clients.md
 [milestone]: https://github.com/encode/django-rest-framework/milestone/35
 [release-notes]: release-notes#34
 [metadata]: ../api-guide/metadata/#custom-metadata-classes

docs/community/3.6-announcement.md

@@ -195,5 +195,5 @@ on realtime support, for the 3.7 release.
 [sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
 [funding]: funding.md
 [api-docs]: ../topics/documenting-your-api.md
-[js-docs]: ../topics/api-clients.md#javascript-client-library
-[py-docs]: ../topics/api-clients.md#python-client-library
+[js-docs]: https://github.com/encode/django-rest-framework/blob/3.14.0/docs/topics/api-clients.md#javascript-client-library
+[py-docs]: https://github.com/encode/django-rest-framework/blob/3.14.0/docs/topics/api-clients.md#python-client-library