Renames the help article on custom profile fields to reflect that
its content is not just about adding fields.
Adds a redirect from the old URL to the new URL and updates internal
links, linking to #add-a-custom-profile-field where appropriate.
Fixes#23170.
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.
The check-handlebars-templates script now looks at most of our
back end templates to try and find imbalanced tags. This commit
fixes a bunch of the existing templates.
(imported from commit fad4a5d85d68160370dd588b41d6f125f64d198f)