Fix : recreate the termux guide to adapt the recent changes (#4472)

* Fix : recreate the termux guide to adapt the recent changes

Termux nodejs-lts changed from v14 to v16 and there are many issues people are facing such as with argon2. Hence I recommend changing it to this install process which is comparably better and has one less issue :^)

I've also added some extra things such as installing GO and Python, idk about the TOC tree but this is pretty much it.

* yarn-fmt and minor typos

https://github.com/cdr/code-server/pull/4472#issuecomment-964752180

* Fix : replace unnecessary steps to be linked to a guide

* Change from private gist to a section in Extra

* Remove reference to non-existent step

* ready to merge!

Co-authored-by: Joe Previte <jjprevite@gmail.com>