## Description
Make code "remix" friendly.
- [x] - Remove specific handlers for canvas and builder
- [x] - Use naive remix root.tsx entri.client and entri.server (we do
not use hydrate on client, we inject stitches on the server, anything
else is the same as in default remix project)
- [x] - Use `_ui` layout for builder, dashboard and login pages
- [x] - Render canvas layout in $.tsx
- [x] - Remove root.tsx
## Steps for reproduction
1. click button
2. expect xyz
## Code Review
- [ ] hi @kof, I need you to do
- conceptual review (architecture, feature-correctness)
- detailed review (read every line)
- test it on preview
## Before requesting a review
- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")
## Before merging
- [ ] tested locally and on preview environment (preview dev login:
5de6)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file
