Remove deprecated models and mobx usage (react-query refactor) (#1934)

* Update login page to use service query

* Update modal to use session instead of store

* Move image sizes cache off store

* Update settings to no longer use store

* Update link-meta fetch to use agent instead of rootstore

* Remove deprecated resolveName()

* Delete deprecated link-metas cache

* Delete deprecated posts cache

* Delete all remaining mobx models, including the root store

* Strip out unused mobx observer wrappers

src/lib/strings/url-helpers.ts

@@ -1,5 +1,5 @@
 import {AtUri} from '@atproto/api'
-import {PROD_SERVICE} from 'state/index'
+import {PROD_SERVICE} from 'lib/constants'
 import TLDs from 'tlds'
 import psl from 'psl'