Verify experimental bundle and remove the `--experimental` flag (9x smaller bundle size)

[fedorovvvv]

Need to verify that everything works correctly with npx @forgeplan/web init --experimental.

The idea is that dependencies are tree-shaken via esbuild, which reduces the bundle size from ~12MB to ~1–2MB.

Need to make sure everything works properly and then move this into stable.

Possible flow:
npx @forgeplan/web init --experimental --force

[fedorovvvv]

Additionally, the README will need to be updated with the new tarball metrics.

[fedorovvvv]

#60

[fedorovvvv]

@explosivebit
Could you check this in the next release (0.1.12) ?

If everything looks good, I'll remove the --experimental flag in v0.1.13 and move this to stable

[fedorovvvv]

@explosivebit is everything working correctly?
Everything looks good on my side.