[docs] Remove Python 2 installation steps
Summary:
We were previously including Python2 because it was needed as part of the sqlite3 build process and Python2 was removed from macOS as of 12.3.0
However, the sqlite3 npm package has recently been updated and this issue has been resolved.
Depends on D4055
Test Plan:
- Remove Python 2
- Ensure that Python 2 is uninstalled by running which python and where python (Python 3 is python3)
- Run yarn cleaninstall and see if it succeeds
Log output from above steps: https://gist.github.com/atulsmadhugiri/20ce9839b5b6f9fb142b02078e0f7b18#file-yarn-cleaninstall-sans-python2
Reviewers: def-au1t, palys-swm, ashoat, benschac
Reviewed By: ashoat
Subscribers: Adrian, yayabosh
Differential Revision: https://phabricator.ashoat.com/D4059