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

app/models/favourite.rb

@@ -13,6 +13,8 @@
 class Favourite < ApplicationRecord
   include Paginable
 
+  update_index('statuses#status', :status) if Chewy.enabled?
+
   belongs_to :account, inverse_of: :favourites
   belongs_to :status,  inverse_of: :favourites, counter_cache: true