DAR-729: Make the edit page layout and preview responsive

Parent ticket: https://wikia-inc.atlassian.net/browse/DAR-729

### Responsive Edit Page
https://wikia-inc.atlassian.net/browse/DAR-887

This changeset introduces style and script changes to make the edit page work with the responsive layout. These changes include:

- Cleaning up edit page layout templates and styles
- Overwriting styles to make the edit page responsive
- Fixes for wide mode (main pages and normal article pages)
- Fixes for autoresizing

### Responsive Edit Preview
https://wikia-inc.atlassian.net/browse/DAR-886