Updated show notes for 20 hour course
[Finishes 61947100]: Easy fix to redirect back to root after last level
Merge branch 'master' of github.com:code-dot-org/dashboard
fix characters and quotes
[Partial 61939842]: tweak text, add nav links for teachers to home
Merge pull request #195 from nanan9177/blockly_fix

 Moved the add teacher form to the bottom. Replaced with a link that let...
[Finishes 61939842]: allow join when signed in, + show teacher UI on home even before adding first student
Updated unplugged videos and pdfs
Merge pull request #196 from nanan9177/blockly_fix

Removed the sign out message since we are redirecting now.
Sign in user when they create an account via course code.
Merge pull request #198 from tobyk100/signin

Sign in user when they create an account via course code.
merge
Merge pull request #197 from code-dot-org/allow_join_signed_in

[Finishes 61939842]: allow join when signed in
Update video
start shifting machines from staging to production
count lines of code from milestone log files on the archive server
Allow a student to join 2 sections with the same teacher
Translations
A small twick to move the add teach link to a separate line.