Make organization navigation item conditional

[agjohnson]

Moved from

• 299

I made an attempt at this and had success, but the additional logic slowed down all views considerably. I used the organizations template filters to try to get a list of user organizations. This might need some more thought, and perhaps we do this in the UX side of things instead of using display time logic -- using the organization selection workflow or something?

This is working for now though, it's just very explicit for most users that only need one organization.

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• [ ] When there is only one organization, the menu item should be "Organization" and lead to the detail view for the only org
• [ ] When there are more than one organization, go to the listing view
• [ ] If the user does not have an organization, perhaps also go to the listing view? This might be the best place to show organization creation onboarding?

[agjohnson]

Brought up today, but perhaps this could be fixed using JS instead. The button would not do any checks in the template but would instead wait until the user clicked on the button to fetch a list of organizations and either go to the first organization or show the listing view if there are zero or multiple organizations.

I think this is a good way around this UI element and it improves the UX. Immediately, I was going to use this addition to get past the slow organization queryset noted here:

• https://github.com/readthedocs/readthedocs-corporate/issues/1829

However, in testing, this queryset is still used for detail views and the pages are not any quicker to load. I'll still bump this up a little bit on our roadmap, because I think it would be a nicer UX.