Syncing your work
There a a few possibilities to work together on a documentation/webpage based on MkDocs.
The following variants are only examples.
Using GIT (our git system git.ist.ac.at)
Just login to git.ist.ac.at and create a new project. Create the project with a ReadMe.md file, and clone the project to the system where you'd like to serve the pages from. (e.g. login.ist.ac.at)
Now start by creating/copying the necessary files to this directory, do
git add -A
git commit -m 'My commit message'
git push origin master
and your data is on git.ist.ac.at. Don't forget to either push/pull and doing a mkdocs build after an update.
Using the ISTCloud (seafile.ist.ac.at)
If your project has been setup like the example, which includes that the actual deployment (mkdocs build) directly into the public_html folder, you can just sync the project folder by drag it into your Seafile client.

This should create a new library in the ISTCloud, which you can share with anyone you'd like to participate on your project, you and your collaborators can either use the built-in editor in Seafile or any other editor. Don't forget to deploy (mkdocs build) after changes have been made.