[squash]: Update sponsorsip and question boxes for Cloud.
[squash]: Update tabs subtitles.
[squash]: Content for info boxes for self-hosted plans.
[squash]: Adjust content to fit design.
portico: Tweak /plans text.
Removes the default title element of "Zulip" from `base.html` and
the default meta-description sentence from `meta_tags.html`. Also
removes default open graph metadata.
For portico templates that would would fail tests, set both
`PAGE_TITLE` and `PAGE_DESCRIPTION` variables with appropriate
content.
Co-authored-by: Alya Abbott <alya@zulip.com>
Renames existing template variables starting with `OPEN_GRAPH` to be
either `PAGE` or `PAGE_METADATA` since these variables are used for
adding both open graph metdata and page titles/descriptions for SEO.