Docs transfer sizes are now larger with new theme

[JacksonChen666]

New docs with new theme is now significantly larger (2.76 MB / 1.07 MB transferred with uBO), larger than a heavily optimized PNG (212 KB, oxipng -o max, "Laptop with HiDPI Screen" on https://synadm.readthedocs.io/en/latest/synadm.cli.room.html in light theme). Using uBO to prevent scripts and fonts from loading (breaking functionality somewhat) reduces that down to 485.54 kB / 94.31 kB transferred, so there is definitely room for improvement.

Previous docs theme is only 792.22 kB / 276.40 kB transferred (uBO). (No scripts and fonts is 190.25 kB / 36.26 kB transferred)

The first thing to look at is reducing/replacing FontAwesome (https://pydata-sphinx-theme.readthedocs.io/en/stable/user_guide/fonts.html)