feat: command bar
- Add command bar for post and page
- Add command bar actions
- Share to: allow to share the post/page to LinkedIn, Twitter and Facebook
- Table of contents: open aright panel that display a table of contents based on the headers into the page
- Published date: display the published date of the post/page
- Scroll to top: disabled by default, become enable once the scroll page is over 1/3 of the page height
- Support Panel overflow
- Create primary button style
.button-primary