Adds menu to layout
Various updates

- Adds optional chapter when adding phrases
- Orders chapters in book by title
- Updates BookFilter so it also filters when chapters are requested
- Changes order of fields in ChapterType
- Updates templates
Dependencies

- Uses a versioned dependency for symfony and bootstrap
- Adds dependency to jquery
- Updates lock file
Assets and twig functions

- Uses scss instead of scssphp to compile scss to css
- Defines several assets in config.yml
- Defines ajax template
- Adds TwigExtensionsBundle with configurable template names
- Adds jquery and bootstrap javascripts in normal layout