Displaying old bootcamps in descending order
Merge pull request #455 from gvwilson/sorting-previous-bootcamps-descending

Displaying old bootcamps in descending order
Link to Version 5 teaching materials.

1. Change navbar to point to new `./lessons.html` page.
2. Create `./lessons.html` with links to `v4` and `v5`.

Note that `v5` isn't in this repo - we'll submodule it (or whatever) once it settles down.
Merge pull request #457 from gvwilson/integrating-v5-material

Link to Version 5 teaching materials.
Simplifying the 'about' page
Merge pull request #458 from gvwilson/simplifying-about-page

Simplifying the 'about' page
Blog post from Cordelia Brown
Merge pull request #459 from gvwilson/blog-do-not-be-worried

Blog post from Cordelia Brown
Merge branch 'master' into changing-irc-link
Explaining why we're changing IRC channels