update jekyll config

README.md

@@ -11,26 +11,28 @@ Live pages are available at https://lsm-hpce.gitpages.psi.ch.
 The easiest and most reproducable way to test changes is using docker.
 From the top directory, run the following:
 
-```
-docker-compose up
+```console
+$ docker compose build
+$ docker compose up
 ```
 
-This will start a webserver on `http://0.0.0.0:4000/`. Changes to most pages
+This will start a webserver on `http://0.0.0.0:4001/`. Changes to most pages
 will be automatically reflected in the website (with the exception of changes
-to _config.yml, which requires restarting the webserver).
+to `config.yml`, which requires restarting the webserver).
 
 ### Running locally
+
 Building locally requires ruby 2.5 and bundler. To install:
 
-```
-gem install bundler jekyll
-bundle
+```console
+$ gem install bundler jekyll
+$ bundle
 ```
 
 To run a local webserver:
 
-```
-bundle exec jekyll serve
+```console
+$ bundle exec jekyll serve
 ```
 
 ## Theme
@@ -62,4 +64,4 @@ by Tom Johnson.
 Theme content is licensed under the MIT license.
 The Navgoco jQuery component used in the sidebar is licensed under the BSD
 license.
-See licenses subdirectory for license terms.
+See licenses subdirectory for license terms.