R1:fb1cc8cc58a4

Remove Lamson documentation

Summary:
Fixes T11054. This project's website has been down for more than a year:

<https://github.com/zedshaw/lamson/issues/36>

It hasn't received any new commits for three years (March, 2013):

<https://github.com/zedshaw/lamson/commits/master>

Instructions like this are a good candidate for community ownership rather than upstream maintenance. I don't think we'd accept these instructions upstream today.

Test Plan: `grep -i lamson`

Reviewers: chad

Reviewed By: chad…