learning circles

coordinate study groups for online courses

save custom ls name and course description, update help text, make image preview a circle

Merge pull request from p2pu/lc_signup_page fixing up lc signup page and dashboard

add draft warning on signup page, update language input label, fix signup success page

use weeks for duration on draft lcs; back button uses prev url; added AOS; fixed styling; added signup_count to API, merged upcoming and current LC tables on dashboard

add draft warning on signup page, update language input label, fix signup success page

use weeks for duration on draft lcs; back button uses prev url; added AOS; fixed styling; added signup_count to API, merged upcoming and current LC tables on dashboard

Merge pull request from p2pu/dependabot/pip/django-2.2.13 Bump django from 2.2.10 to 2.2.13