[docs] Add some link `Edit on GitHub` to tutorials pages

[vadimkantorov]

🚀 The feature, motivation and pitch

Can't find any "edit on github":

Also, on small laptop screen menu panels everywhere (on left, on right, on top, on bottom) is a bit overwhelming. The older Sphinx design was leaner.

Alternatives

No response

Additional context

No response

cc @svekars @sekyondaMeta @AlannaBurke

[malfet]

Moving to tutorials repo...

[vadimkantorov]

IMO the right panel is not very useful (and not worth the viewport real estate / clutter on small laptop screens):

Also, seems an overly aggressive ellipsis: