Initial import of Template:HTMLSidebar
Initial import of Template:HTMLSidebar

https://developer.mozilla.org/en-US/docs/Template:HTMLSidebar

Contributors (by MDN username):
* BychekRU
* fscholz
* SphinxKnight

jpmedley/kumascript,jpmedley/kumascript,a2sheppy/kumascript,a2sheppy/kumascript