New frontend

Some of the new features in the new frontend include:

A visual way to edit individual worksheet items -- a much easier way than having to edit the entire worksheet source.
Worksheet header is now sticky and has buttons "Text", "Upload", and "Run" that let you insert a new cell (#1424, #1510, #1549)
Support bundle bulk operation on web UI, which replaces the context menu for bundle rows (#1705, #1579).
New UI for bundle detail layout (#1543)
New keyboard shortcuts (#1578, #1649, #1718)

Other features

Fix mathjax causing crash in race case (#1489)
Add libssl-dev for mysqlclient (#1738)
Raise error when dependency is empty in CLI (#1566)
fix-time-quota-miscalculation (#1687)
Refactor bundle_manager.py to have less db calls (#1631)
Avoid db call in deduct_worker_resources for every single running bundle (#1741)
redirect to home/dashboard when going to /worksheets link (#1719)
Update DockerImageManager cleanup function and fix out of sync dependencies in worker (#1502)
Update genpath of owner_name to be owner instead (#1669)
Update sql query to make jobs transition faster (#1537)
Add deleting foreign key uuid in worker_run table before dropping the uuid in bundle table (#1551)
Improve logging details (#1602)
Don't raise an exception when bundle is not found on target worker (#1627)
Refactor CSS (#1603)
Fix autocomplete command (#1645)