Add most missing default QuillJS buttons

Customers who are using the rich text editor for writing articles suffer from limitations that prevent them from completing their article. This is due to the fact we are not exposing all the default options available in QuillJS.

In order to unblock them, we will add the following option:

• Video link
• "Code" button (adds an unformatted text block, i.e. a "pre" tag in HTML)
• Indent
• Remove Indent

These options will NOT be added

• Change font option: serif, sans serif, monospace => NOT adding, could have an impact on the articles use case (you don't want people to force a font that will clash with your branding)
• Font size: small, normal, large, huge => NOT adding, could have an impact on the articles use case (you don't want people to force a font size that will clash with your branding)
• Math formula (requires Katex https://katex.org/) => requires a new dependency and no explicit use case for it