perf(snapshot): avoid costly generation of <a> element on each call to `getHref`, instead cache an anchor element and reuse it's href attributed

---------

Co-authored-by: Eoghan Murray <eoghan@getthere.ie>

…later modified (rrweb-io#1467)

* Fix that blob urls persist on the shared anchor element and can't be later modified

* Create nervous-kiwis-nail.md

Some dev improvements:
* Add .editorconfig config file https://editorconfig.org/
* move the singleQuote spec into .editorconfig and add old .changesets/*.md to .prettierignore so that we don't incorrectly reformat new changeset files to single quote from the double quote which they can be autogenerated with in github
* .gitignore Ignore emacs chaff files
* Add `yarn format:head` a convenience command to run prettier against just those files in the head commit
* Some mention of `yarn format` in the docs
* Fix some test html closing tags; authoring mistakes, rather than deliberately malformed html — picked up by an explicit `yarn prettier --write '**/*.html'`

* Fix that the `.replace()` function only replaces the first occurrence

* This should have been included in rrweb-io#1174

* Create fast-pets-exist.md

This work is to try to provide support where rrweb might be included
in applications with various tools that might override Array.from
so that the 2nd parameter (the map function) will always work for
rrweb.

Co-authored-by: Michael Dellanoce <mdellanoce@pendo.io>

* Fix and test for bug rrweb-io#1457 (Uncaught SyntaxError: Regular expression too large)

 - see test case which is extracted from a real world css file; the selector regex was able to traverse the curly brace as when looking for quotes, it wasn't taking into account that the start quote could be escaped

* Apply formatting changes

* Create fair-ducks-clean.md

* Fix @import regex bit which was stopping consumption in the middle of a url - need to consume quotes.

Thanks dave.kindel@pendo.io for reporting and isolating this case

---------

Co-authored-by: eoghanmurray <eoghanmurray@users.noreply.github.com>

This work is to try to provide support where rrweb might be included
in applications with various tools that might override Array.from
so that the 2nd parameter (the map function) will always work for
rrweb.

Co-authored-by: Michael Dellanoce <mdellanoce@pendo.io>

…update-e96f668c86bd0ab5dc190bb2957a170271bb2ebc

…7a170271bb2ebc

…7a170271bb2ebc

…7a170271bb2ebc

Merges up to commit 46f1b25

…25bd6089cc2e7d34e7c