Documentation Issue: Contributing section on home page has alignment issues

[pushfoo]

Bug / Documentation:

TL;DR: The Contributing heading on the home page is ugly in full screen and half-screen views

Replication steps

1. Check out the repo
2. pip install -Ie .[dev]
3. ./make.py serve
4. Go to http://localhost:8000
5. Scroll down

Examples

Full screen

Half screen

[lbcai]

Taking care of this.