Renames context variables used for the pricing model template for
when the customer has a current plan that has an upgrade to a new
plan tier scheduled.
Fixes the "Upgrade scheduled" note that was being shown when an
annual fixed-price plan has a subsequent fixed-price plan scheduled
to start when the current plan ends.
Prep for adding a complimentary access plan for Zulip Cloud.
This is a follow-up to #32693, which missed a bunch of places due to
varying ways of typing Azure AD. (Azure AD, Azure Active Directory etc.)
In the diff there's an apparent inconsistency with renaming, in some
places renaming to just "Microsoft Entra ID" and in others
"Microsoft Entra ID (AzureAD)".
The idea is to add (AzureAD) in ordinary documentation, as it can help
clarity since many people still think of this as AzureAD, while sticking
with brevity and cleanliness of just using the official name in
marketing focused material.
Renames file and redirects existing links to "help/user-roles" as
the previous content tracks to that current file's content.
Updates existing links (excluding ReadtheDocs) to go to either
"help/user-roles" or "help/manage-permissions" depending on which
help center article applies to the content.
This also now allows user to upgrade to plus plan from pricing page.
Note that since we don't pass customer_plan on pages like self-hosting
and for/business, `Current plan` status is not displayed on these pages.
Fixes#28621
Till now, this was actually a flat 50GB despite what the /plans/ page
says and was adjusted flexibly when somebody asked for a higher limit.
This actually implements the advertised formula, but changing it to
5GB/user since that's a more reasonable limit.
Keeps the 50GB limit for sponsored Standard Free organizations and also
places it as the floor for the quota for paid orgs, to not lower this
for tiny orgs with less than 5 users.
Because we can now extend the end date for legacy self-hosted plans,
instead of hard-coding the generic end date in the plans template,
show the specific end date for the current legacy plan.
This adds the new tabs from /plans to:
* /for/business
* /self-hosting
And it isolates legacy styles to preserve the tabs on
/for/education
Fixes: #28013
[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.
