The `overflow: auto;` from the `.markdown` class hides the description
of the picture. I moved the description outside the div with the
`markdown` class.
I didn't remove zulip_version from context_processors since it seems likely
that we'll want to put that information somewhere on portico at some point.
This commit transitions landing-page.css from the Django pipeline
to being compiled by webpack as landing-page.scss under the
'landing-page' and 'integration' bundles.
Apparently, essentially every one of our landing pages extending
portico.html had two copies of portico.css included in their head
section; one from porticocustomhead (or the super of customhead) and
the other directly included.
Clean this up by removing all these duplicate inclusions of the
portico stylesheet.