* Upload docs to main branch of neps/devdocs

* Update `master` to `main` to be consistent with current state of renaming

* Remove badges from README

* Replace remaining instances of `master` with `main`

* Add back logo

* Fix CircleCI branch checks

* Fix GA branch name

* master->main in issue templates.

* master->main for 2 links to numpy archive.

* Change master to main in NEP 23

Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>

* DOC: Fixes for 18 broken links

This, with PR #16465, should fix nearly all the remaining broken links
on the site. 4 or 5 others should be easy to fix and just
need attention from someone more knowledgeable -- will
open an issue. For release notes with dead links,
I could usually find links on archive.org for roughly contemporary
versions.

* DOC: Update to "Fixes for 18 broken links #16472"

* Obsolete links, previously commented out, now deleted:
https://github.com/numpy/numpy/pull/16472#discussion_r433928958

* Semantic markup for reference to Python class:
https://github.com/numpy/numpy/pull/16472#discussion_r433553928

* Missing :ref: in internal link:
https://github.com/numpy/numpy/pull/16472#discussion_r433554484

Not included: Resolution on using external/internal doc link in .py:
https://github.com/numpy/numpy/pull/16472#discussion_r433554824

* DOC: Add internal link for 'Fixes for 18 broken links' PR #16472

Making reference [1] an internal link in function_base.py => numpy.vectorize.html

* DOC: Redirect 2 link fixes in PR #16472

* governance.rst link reverted
* ununcs.rst `overridden` link goes where it was meant to


per https://github.com/numpy/numpy/pull/16472#pullrequestreview-424666070

Fixed links for branch delete and graph visualizer.

Updated instructions for branch delete (git since 1.7.0 (Sept 2010)
has allowed --delete sted ':').

'Learn git' link pointed to Bitbucket instructions; replaced with GitHub
instructions.

Minor rewording in 'Pushing changes to the main repo'.

This is NOT a review of the page, only some fixes.

The "Basic Workflow" section of the Development Workflow page was reorganized
to make it clearer to new users and remove/update old material.

Major changes:

- Moved the core developer notes. Core dev notes are confusing in basic usage
  information. Updated a couple of the commands

- Added more commands and reorgaized the "New Feature Branch" section. Took
  some text from "Rebasing" and moved it here, because it was redundant.

- Made many changes to the "Editing Workflow" to clarify commands. Moved some
  git push stuff into this section as well.

- Moved pull request section to just after editing workflow. Removed outdated
  images and simplified the text. Make code review requirements explicit.

- Moved rebasing and troubleshooting sections to the end. Could add more here
  later.

- Links renamed and broken link removed.