FIX (loading files over 1mb): Add load file button on truncated content, changed editor to be self contained.

- WIP
- Not fully operational

breaks:
create gist screen
STYLE (css): fix css colors and glitches

- fix colors for dark themes
- fix 'fork' and 'share' bubbles layout
STYLE (css): fix css colors and glitches

- fix colors for dark themes
- fix 'fork' and 'share' bubbles layout