* docs: sync table of content from pull-requests.md to CONTRIBUTING.md

This also fixes some incorrect / dead links.

* docs: fix a bunch of typos

Co-Authored-By: Lee Dohm <1038121+lee-dohm@users.noreply.github.com>

Co-Authored-By: Lee Dohm <1038121+lee-dohm@users.noreply.github.com>

* add issues document

* add documentation coding style to doc

* copyediting

* replace `nodejs/node` with `electron/electron`
* fix commasplice
* fix two most important... s/is/are/
* omit unnecessary words

* add pull requests doc

* copyediting

* add general code style to styleguide

* updates to CONTRIBUTING.md

* copyediting

* mark shell blocks as ```sh
* mitigate phrase duplication e.g. 'best practice'
* lots of opinionated changes to omit unnecessary words

* fix numbering & re-apply changes that I overwrote

* Update CONTRIBUTING.md with link to development docs

[ci skip]

* Use relative link to development documentation

[ci skip]