(the flake build does take long, and it's only a dev dependency anyways)

https://dev.to/thejaredwilcurt/bun-hype-how-we-learned-nothing-from-yarn-2n3j

This simplifies the multitude of nix files that we have into 1 single flake.

CI is slow and this might be too much

Merge remote-tracking branch 'origin/644-tree-node-graph-update-remove-it-the-resync-picto-no-longer-launch-a-reload-it-should-open-the-dialog-box-on-the-graph-reload-form-confirmation' into dev