Moving blog post into correct directory
Merge pull request #452 from gvwilson/relocating-blog-post

Moving blog post into correct directory
Who are our instructors?
Merge pull request #453 from gvwilson/blog-summarizing-instructors

Blog post about who our instructors are
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.