API DOCS Step 3/3 (#92929)

* update api_docs from gitignore

* api doc files

* Update api_welcome.mdx

* Pretty print json

* Add new lines and extra frontmatter to warn github viewers

* update api_docs with new lines and frontmatter

* Remove all apis tagged @internal and add tests

* Update docs with all internal APIs removed

* fix typescript error in test fixtures

* Update core.json

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

.gitignore

@@ -1,6 +1,5 @@
 .aws-config.json
 .signing-config.json
-/api_docs
 .ackrc
 /.es
 /.chromium