chore: bump version

docs: incorrect information

We don't use org-babel's temoporary directory because I had issues with the symbol name in
older emacs version and I am too lazy to figure it out.
I think using /tmp/ is acceptable.

fix: ci nag

fix: use `nix-instantiate` to check for derivation errors.

Previously we used `nix-shell` which also loads the shell and runs shellHooks etc.
This can be expensive.

ci: latest emacs version

repo: bump version

repo: bump version number

feat(repo): nix installation

I should package it properly once I have tested it enough to know.