* Adjust mobile landing page
Change mobile viewport threshold to 840px in consideration of padding. Fix loss of "container hero" padding in about/more under 675px.
* Fix indent
Setting only padding-left made the logo left-shifted on mobile page. Margin-right was old setting for adjusting clearance between old logo and letter "Mastodon".
Though size of extended-video-player is already fixed to 80vw*80vh in components.scss, player size was also set to original video size in extended_video_player.js. Video size is fixed to 80vw*80vh, so video player's size must also be fixed to 80vw*80vh.
* Shrink too wide single image modal
Fix too wide react-swipeable-view-container
Fix 0067f80 shrinking all react-swipeable-view-container
Change to apply max-width of react-swipeable-view-container only under media-modal.
Fix b30b03b just a typo
* Centering contents in image-loader
Centering small img, canvas, and video in image-loader.
Lynx Kotoura