Round out the Fund model with UI

[lomky]

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• What are we trying to do?

• Create a Fund data edit page, restricted to admin editing

• What feature or behavior is this required for?
  Create a fully fleshed out Fund model - work initially started in ActsAsTenant pt 2: Use fund objects instead of env vars for full name, phone, etc #2403

• How could we solve this issue? (Not knowing is okay!)
  Pretty standard rails, methinks?

• Anything else?
  @colinxfleming to add any more details or split this up!

[colinxfleming]

yep, let's do this! Some fields on this model are sacred but some are safe to change. I think roughly:

• in its own controller/view, permissioned to admin only (Configs is a safe approach to copy)
• accessible thru the admin dropdown in the toolbar

* let's have the URLs be GET /funds/edit for the form view, and PUT/PATCH /funds for the update action (similar to how `users` actions are set up). This is because a user session should be scoped to a particular fund as is and there's never a reason to have multiple-fund access like that. * fields that should be editable: full_name, site_domain, phone

[cameron-hicks]

Starting on this! Pairing welcome.