removed centos section, added note about github action

README.md

@@ -37,70 +37,16 @@ nikola help
 
 ## Deployment to github pages
 
+Happens via [.github/workflows/main.yml](.github/workflows/main.yml) 
+action automatically, but can be manually performed as well:
+
 * requires `ghp-import` package
 * command for deploying
 
     ```
     nikola github_deploy
     ```
 
-
-## jenkins on CentOS
-
-CentOS does not have Python 3.5 packages directly available through packages,
-but rather through *software collections* (`scl`). 
-
-Python 3.5 is enabled like this (from an interactive shell):
-
-```bash
-/bin/scl enable rh-python35 bash
-```
-
-Assuming that the weka-blog repo is installed in `/var/lib/jenkins/repos/weka-blog`, 
-you can use the *Execute shell* build step with this script to automatic deploy
-the github pages *if* the repo has changed:
-
-```bash
-cd /var/lib/jenkins/repos/weka-blog
-COUNT=`git pull | grep -v "Already up-to-date" | wc -l`
-if [ $COUNT -gt 0 ]
-then 
-  /bin/scl enable rh-python35 - << \EOF
-cd /var/lib/jenkins/repos/weka-blog
-/var/lib/jenkins/repos/weka-blog/venv/bin/nikola github_deploy
-EOF
-fi
-```
-
-For getting the jenkins user to deploy to github, you need to:
-
-* create an ssh key as user jenkins
-
-  ```bash
-  ssh-keygen -t rsa -f ~/.ssh/github_wekablog
-  ```
-
-* add the following to `~/.ssh/config`
-
-  ```
-  Host github-wekablog
-     HostName github.com
-     User git
-     IdentityFile ~/.ssh/github_wekablog
-     IdentitiesOnly yes
-  ```
-
-* add the public ssh key under the repo's *Settings -> Deploy keys* 
-  with *write* access
-
-* update the `.git/config` file in the checked out repo, changing the 
-  *remote origin* URL to this (using the just created identity):
-
-  ```
-  url = git@github-wekablog:Waikato/weka-blog.git
-  ```
-
-
 ## Blogging
 
 * posts go into the `posts` directory