add section about the Give-Up Github campaign

github.md

@@ -52,6 +52,7 @@
 [48]: images/github_ban.png
 [49]: https://www.iccl.ie/digital-data/iccl-report-on-the-scale-of-real-time-bidding-data-broadcasts-in-the-u-s-and-europe/
 [50]: https://github.com/wireapp/kalium#github-packages-authentication
+[51]: https://sfconservancy.org/GiveUpGitHub
 
 # Direct practical problems with using Microsoft Github
 
@@ -97,7 +98,7 @@
 
 ## Ethical problems with using Microsoft products and services
 
-8. Microsoft harms the **environment** by serving the two most destructive oil companies in the world: [ExxonMobil][9] and [Chevron][10].
+9. Microsoft harms the **environment** by serving the two most destructive oil companies in the world: [ExxonMobil][9] and [Chevron][10].
     1. (#ExxonKnew) Exxon notoriously [knew][11] about climate change
        since 1977.  They not only kept it secret from the public, but
        they also financed a disinformation campaign.
@@ -180,3 +181,8 @@
        actually wants Windows.
     1. MS [hoards][42] software patents and uses them to [fight free software][43].
     1. Github [has an F rating][44] by the FSF.
+
+## Remedial actions
+
+The Software Conservancy has a [Give Up Github campaign][51] which
+suggests actions you can take to help support this movement.