add redirects (#125)

Author: jordan-smith721

config/redirects

@@ -67,10 +67,12 @@ raw: ${prefix}/stable -> ${base}/current/
 [v9.0-*]: ${prefix}/${version}/reference/transactions/ -> ${base}/${version}/interact-data/transaction/
 [v9.0-*]: ${prefix}/${version}/release-notes/upgrading/ -> ${base}/${version}/whats-new/
 [v9.0-*]: ${prefix}/${version}/release-notes/mongoid-9.0/ -> ${base}/${version}/whats-new/
+[v9.0-*]: ${prefix}/${version}/release-notes/mongoid-8.0/ -> ${base}/${version}/whats-new/
 [v9.0-*]: ${prefix}/${version}/contributing/code-documentation/ -> ${base}/${version}/code-documentation/
 [v9.0-*]: ${prefix}/${version}/contributing/contributing-guidelines/ -> ${base}/${version}/issues-and-help/
 [v9.0-*]: ${prefix}/${version}/additional-resources/ -> ${base}/${version}/integrations-tools/external-resources/
 [v9.0-*]: ${prefix}/${version}/ecosystem/ -> ${base}/${version}/integrations-tools/external-resources/
+[v9.0-*]: ${prefix}/${version}installation-configuration/ -> ${base}/${version}/configuration/app-config/
 
 # Redirects for updated API pages
 [v9.0-*]: ${prefix}/${version}/api/Mongoid/Association/Referenced/NestedAttributes.html -> ${base}/${version}/api/Mongoid/Association/Referenced.html
@@ -81,3 +83,4 @@ raw: ${prefix}/stable -> ${base}/current/
 [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
+raw: ${prefix}/master/api/Mongoid/Document.html -> ${base}/current/api/Mongoid/Document.html # resolve 404 error