DOCSP-47088 API Internal 404s (#102)

Author: lindseymoore

config/redirects

@@ -78,3 +78,5 @@ raw: ${prefix}/stable -> ${base}/current/
 [v9.0-*]: ${prefix}/${version}/api/BSON/ObjectId.html -> ${base}/${version}/api/Mongoid/Extensions/ObjectId.html
 [v9.0-*]: ${prefix}/${version}/api/Mongoid/Association/Referenced/NestedAttributes/One.html -> ${base}/${version}/api/Mongoid/Association/Nested/One.html
 [v9.0-*]: ${prefix}/${version}/api/Mongoid/Criteria/Inspectable.html -> ${base}/${version}/api/Mongoid/Criteria.html
+[v9.0-*]: ${prefix}/${version}/api/Mongoid/Errors/InvalidStorageParent.html -> ${base}/${version}/api/ # resolve 404 for removed InvalidStorageParent class
+[v9.0-*]: ${prefix}/${version}/api/Post.html -> ${base}/${version}/api/ # resolve 404 for removed entry