Add lang identifiers to shell based codeblocks

docs/_docs/github-pages.md

@@ -123,7 +123,7 @@ to see more detailed examples.
 
 Once the project is configured with the github-pages environment, it's quite hard to switch back and forth with the local settings and the production-level settings. For that we can use certain CLI options to make the workflow hassle-free.  
 
-```
+```sh
 bundle exec jekyll serve --baseurl=""
 ```
 

docs/_docs/index.md

@@ -24,19 +24,19 @@ See [Requirements]({{ '/docs/installation/#requirements' | relative_url }}) for
 
 1. Install all [prerequisites]({{ '/docs/installation/' | relative_url }}).
 2. Install the jekyll and bundler [gems]({{ '/docs/ruby-101/#gems' | relative_url }}).
-```
+```sh
 gem install jekyll bundler
 ```
 3. Create a new Jekyll site at `./myblog`.
-```
+```sh
 jekyll new myblog
 ```
 4. Change into your new directory.
-```
+```sh
 cd myblog
 ```
 5. Build the site and make it available on a local server.
-```
+```sh
 bundle exec jekyll serve
 ```
 6. Browse to [http://localhost:4000](http://localhost:4000){:target="_blank"}