Improved Catnip

[philmtd]

This is a larger change that was required in order to improve the overall user experience of O-Neko catnip.

The main changes are:

• After opening a deployment's URL, the user is now redirected to a catnip base-URL which then hosts the frontend
• Improved frontend-build. Only minimal frameworks in a basic project using Vite, Alpine and Tailwind. This comes with a redesign of the catnip frontend.
• Now the backend does the polling of the starting deployment while the frontend asks the Catnip backend through a simple API.

This addresses the following issues:

• users could not reload the wakeup-frontend because then they'd not land on the catnip backend (because the ingress of the starting deployment would exist already)
• deploys were initiated before serving the frontend. this led to users sometimes not being able to load all frontend resources (css, js), because those requests would already reach the ingress of the starting deployment (and would result in errors)
• The previously overall mediocre user experience should now be improved

This is a breaking change and it requires the O-Neko changes introduced in subshell/o-neko#102 (and the other way round). Earlier versions of O-Neko will not work with the new catnip and newer versions of O-Neko will not work with earlier catnip versions.

[philmtd]

After this is closed and released, subshell/helm-charts#9 can be merged.