Use HTMX to load page content without genaral page structure. Stage 2

[AntonLV]

https://htmx.org/reference/

Also:

• 1. Use for tabs - https://htmx.org/examples/tabs-javascript/

Issues:

• 1. Account settings. Any form that has content will popup the message about leaving the page will lose the data, HTMX fires before you press yes or no, so it always loads. Note. This issue can be addressed later. Because for now HTMX is a part of Artificer template while form checking is in core.
• 2. Header text bug: https://unacms.com/cmts-view/i2d575?sys=bx_forum&cmt_id=49980
• 3. If Groups page has Messenger block, it works if directly going to URL. If you go to a different tab (example: Info) then back to Groups, messenger block shows, but it does not activate properly. The input message box stays compact and you can not write anything.

Related issues: #4641