* Add .nvmrc file to longclaw/client to keep us all on the same version of node
It's also inline with the version of node that is used in the github actions workflow
* Adding some further documentation to the README.md
It should help people to understand the current status of the project and
how to get started with development.
* Let github actions run on all branches
* Test py 37,38,39 (#1) dj 22 wt 211,212,213
* Fixes the template include issue with the lock/unlock menu item
* Pin the upper bound of the supported Wagtail version to 2.13 and Django to 2.2
* Add some initial documentation for development setup