filter-branch / rebase imminent in the coming weeks

[tony]

Same as tmux-python/tmuxp#732, I want to cut down bloat in the repositories.

I will run the same cleanup on tmuxp I do on libtmux, but will also try to curate some screenshots/animated gifs and optimize them well

Potentially i will move binary images to gh-pages or a branch. Not sure.

This is one time thing. Also I think we're too small for git-lfs to make sense but I will investigate the tradeoffs of that.

If we used git-lfs and it didn't break stuff downstream, I'd be much more willing to commit screenshots / graphics and styling.

On word on docs

1. Further I am concerned that us moving documentation to a different project, e.g. from sphinx to docusaurus, is going to bloat the repo size further. I am still investigating solutions with that.

2. I am going to investigate porting our docs so they have versioning back to past releases. The problem is if we go with docusaurus, I am concerned on us having a perfect alignment of page links