chore[docs]: add binary installation methods

[DanielSchiavini]

What I did

• Add binaries to the documentation
• Show pip before docker, as it might be more common and easier to install
• Update python requirement

How I did it

N/A

How to verify it

N/A

Commit message

- Add instructions to install the binaries from github releases to the
  documentation
- Show pip before docker, as it might be more common and easier to
  install
- Update python requirement in the installation docs

Description for the changelog

N/A

Cute Animal Picture

[charles-cooper]

we can also add try.vyperlang.org