Fix deploying documentation

[mattBrzezinski]

PR #1 did not resolve this, looking at the CI job when running:

Switched to a new branch 'gh-pages'
Branch 'gh-pages' set up to track remote branch 'gh-pages' from 'upstream'.
[gh-pages 45b9221] build based on 6ea831f
 11 files changed, 15986 insertions(+)
 create mode 100644 dev/assets/documenter.js
 create mode 100644 dev/assets/invenia.css
 create mode 100644 dev/assets/search.js
 create mode 100644 dev/assets/themes/documenter-dark.css
 create mode 100644 dev/assets/themes/documenter-light.css
 create mode 100644 dev/assets/themeswap.js
 create mode 100644 dev/index.html
 create mode 100644 dev/search/index.html
 create mode 100644 dev/search_index.js
 create mode 100644 dev/siteinfo.js
Failed to add the RSA host key for IP address '140.82.112.4' to the list of known hosts (/home/runner/.ssh/known_hosts).

[mattBrzezinski]

Also fix the README.md dev badge to point to the dev docs and not stable