Shorten post URI and add hint for baseurl

source/_config.yml

@@ -31,11 +31,13 @@ description: >- # this means to ignore newlines until "baseurl:"
   Write an awesome description for your new site here. You can edit this
   line in _config.yml. It will appear in your document head meta (for
   Google search results) and in your feed.xml site description.
-baseurl: "" # this is not relevant for github pages
+# baseurl: "" # see also github workflow: bundle exec jekyll build --baseurl <github variable>
 url: "" # the base hostname & protocol for your site, e.g. http://example.com
 twitter_username: jekyllrb
 github_username:  jekyll
 
+# shorten blogpost links
+permalink: posts/:title/
 
 # Build settings
 plugins: