Limit CLI options power

We have 25 described CLI option. And some not described (like `hidden`, `storage-endpoint`, `storage-bucket`...)
Most of them are complicated and rare useful.

Proposal:
Move rare useful options to `.yfm` config.
Split `.yfm` config on logical parts:
```yaml
build:
vars:
- var1: test

publish:
endpoint: 'https://bucket.tld'

editor:
hotkeys:
- some-custom-hotkey: 'alt+c'

viewer:
logo: 'https://bucket.tld/static/logo.png'
```