♻️(tilt) simplify the local stack

This commit solves few issues:
- sharing the relevant certificates with minio so when triggering the webhook
notification, the minio pod can verify our backend domain certificates.
- making sure everything spawn in the right namespace (LiveKit and the Egress)
without relying on a dirty fix in the make start-tilt.

all these fixes were made by @rouja, I don't fully understand them yet.
He simplified the stack, removing two Kind nodes to make it lightweight.

thx @rouja.

bin/Tiltfile

@@ -1,7 +1,6 @@
 load('ext://uibutton', 'cmd_button', 'bool_input', 'location')
 load('ext://namespace', 'namespace_create', 'namespace_inject')
 namespace_create('meet')
-
 docker_build(
     'localhost:5001/meet-backend:latest',
     context='..',