Use pa11y-ci-reporter-html and also upload the HTML results to CI if there are any failures

* Redesign docs navbar to use offcanvas, tweak overall padding while I'm here

* Match code snippets to new gutter width

* Replace value with docs-specific variable

Opted not to do a CSS variable here since on .bd-content it would be inherited into our examples

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Co-authored-by: Mark Otto <markd.otto@gmail.com>

`config.delay` is always an object after initialization

This is not used any further, so we were just setting it.

Dropdown: Merge `display='static'` & `isNavbar` functionality activating static popper with no styles attached

Remove a leftover after #32692

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Add note about margins to prevent overflow.

`parseInt` is a global one.

Use:

* toBeNull
* toEqual
* toBeTrue
* toBeFalse
* toHaveSize
* toHaveClass

Correct table lightening variable to match the variable name defined and described in the loop variable section above

* @popperjs/core  ^2.10.2  →  ^2.11.0
* cspell          ^5.13.0  →  ^5.13.1
* postcss         ^8.3.11  →   ^8.4.4
* rollup          ^2.60.1  →  ^2.60.2
* sass            ^1.43.4  →  ^1.44.0

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Co-authored-by: XhmikosR <xhmikosr@gmail.com>