Add doc documenting how to publish a new RobustToolbox version

src/en/robust-toolbox/publishing-robusttoolbox.md

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+# Publishing RobustToolbox
+
+```admonish info
+These instructions are a step-by-step guide for engine maintainers to follow.
+```
+
+1. Open a terminal in the RobustToolbox directory (`cd RobustToolbox` if you are in the space-station-14 directory)
+2. Checkout the master branch (`git checkout master`)
+3. Update your master branch (`git pull https://github.com/space-wizards/RobustToolbox.git master`)
+4. Run version.py (`python ./Tools/version.py 0.1.0`, where 0.1.0 is the version number you want, WITHOUT 'v')
+   - If you use `py` instead on Windows it might not work due to the python microsoft store alias.
+5. Push your commit and tag to RobustToolbox (`git push` and `git push https://github.com/space-wizards/RobustToolbox.git v0.1.0`, WITH 'v')
+   - Do NOT run `git push --tags` as that will push every tag you have locally, even those that have been deleted.
+6. Go back into the content directory (`cd ..`)
+7. Checkout a new branch (`git checkout -b update/robust-0.1.0`)
+8. Push your branch (`git push`)
+9. Open a PR to the content repository and merge it.
+
+```admonish warning
+It is always a good idea to run the game with the new engine version before publishing it and merging the PR, to check that everything still works.
+You can also run tests locally as that will be faster than waiting for them to run on the GitHub workflows.
+```