tabify projects on main dashboard

[xmo-odoo]

With the number of projects and branches we're reaching, mergebot.odoo.com is getting a bit unwieldy although text links can help e.g. https://mergebot.odoo.com/runbot_merge#:~:text=tutorials.

target ids and a jump table would be a good first step, possibly with some sort of quickview for branch states. The next step would be tabs, but I'm not entirely convinced that's as necessary. What would be very useful is a "quick overview" blinkenlight, so that you could get the overall state of projects at a glance e.g. within each project a block per branch, and a pixel / square per staging.