[feature] Move use_blurhash to app settings, enable by default (#5)

Does what it says on the tin! This serves as a decent model (imo) for how to move something from Mastodon's rather opaque server-side settings to client settings.

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/5
Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Co-committed-by: tobi <tobi.smethurst@protonmail.com>

app/javascript/flavours/glitch/initial_state.js

@@ -79,7 +79,6 @@
  * @property {boolean} show_trends
  * @property {boolean} trends_as_landing_page
  * @property {boolean} unfollow_modal
- * @property {boolean} use_blurhash
  * @property {boolean=} use_pending_items
  * @property {string} version
  * @property {string} sso_redirect
@@ -158,7 +157,6 @@ export const timelinePreview = getMeta('timeline_preview');
 export const title = getMeta('title');
 export const trendsAsLanding = getMeta('trends_as_landing_page');
 export const unfollowModal = getMeta('unfollow_modal');
-export const useBlurhash = getMeta('use_blurhash');
 export const usePendingItems = getMeta('use_pending_items');
 export const version = getMeta('version');
 export const languages = initialState?.languages;