Docs: an "improve this page" feature (#144939)

* Docs: a start on an 'improve this page' feature

* pr feedback: simplify the link, and don't scare people with the cla

* pr feedback answered

- use the actual page URL
- tighten the wording

* fix the improve link on the improve page

* news item

* Update Doc/improve-page.rst

Co-authored-by: Stan Ulbrych <[email protected]>

* fix whitespace

* A nojs version of the page

* comments to help people keep the two pages in sync

* protect against XSS

* use template for issues from the nojs page

* use the template from the JS page as well

* give the docs issue template a fillable description field

* ugh, getting sloppy

* remove more sloppiness

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Co-authored-by: Stan Ulbrych <[email protected]>