Full-text search for authorized statuses (#6423)

* Add full-text search for authorized statuses

- Search API will return statuses that match the query
- Only for logged in users
- Only if you are author of the status,
- Or you were mentioned in it
- Or you favourited or reblogged it
- Configuration over `ES_ENABLED`, `ES_HOST`, `ES_PORT`, `ES_PREFIX`
- Run `rails chewy:deploy` to create & populate index

Fix #5880
Fix #4293
Fix #1152

* Add commented out docker-compose configuration for ES container

* Optimize index import, filter search results

* Add basic normalization to the index

* Add better stemming and normalization to the index

* Skip webfinger request if search query includes both @ and a space

* Fix code style

* Visually separate search result sections

* Fix code style issues

.env.production.sample

@@ -9,6 +9,10 @@ DB_USER=postgres
 DB_NAME=postgres
 DB_PASS=
 DB_PORT=5432
+# Optional ElasticSearch configuration
+# ES_ENABLED=true
+# ES_HOST=localhost
+# ES_PORT=9200
 
 # Federation
 # Note: Changing LOCAL_DOMAIN at a later time will cause unwanted side effects, including breaking all existing federation.