Various changes

[naxvog]

Browsed around some Flarum components and integrated some of them to increase general standardization of the extension:

• LoadingIndicator component usage to improve the look and feel
• Loading class for the component wrapper
• Icon component to improve accessibility
• Preview generation on refreshContent to include post updates as well (triggers right after a post was edited without a page refresh)
• General refactoring

[datlechin]

Could you delete the dist folder?

[datlechin]

Thank you <3