docs: Syntax-highlight all the code blocks!

CONTRIBUTING.rst

@@ -27,9 +27,9 @@ correctly:
 
 __ README.rst#installation
 
-.. code::
+.. code:: bash
 
-    pytest
+   pytest
 
 We additionally recommend that you set up your editor / IDE as follows.
 
@@ -46,11 +46,11 @@ We additionally recommend that you set up your editor / IDE as follows.
 
   .. code:: json
 
-      "[python]": {
-          "editor.codeActionsOnSave": {
-              "source.organizeImports": true
-          }
-      }
+     "[python]": {
+         "editor.codeActionsOnSave": {
+             "source.organizeImports": true
+         }
+     }
 
   Note that the Pylance language server is not recommended, as it occasionally
   causes false-positive errors for perfectly valid code.
@@ -61,9 +61,9 @@ We additionally recommend that you set up your editor / IDE as follows.
 
   __ https://github.com/python-lsp/python-lsp-server
 
-  .. code::
+  .. code:: bash
 
-      pip install "python-lsp-server[pylint]" python-lsp-black pyls-isort pylsp-mypy
+     pip install "python-lsp-server[pylint]" python-lsp-black pyls-isort pylsp-mypy
 
   This will provide as-you-type linting as well as automatic formatting on
   save. Language server clients are available for a wide range of editors, from

README.rst

@@ -198,35 +198,35 @@ and use ``capellambse`` in a local, trusted environment.
 
 You can install the latest released version directly from PyPI.
 
-.. code::
+.. code:: bash
 
-    pip install capellambse
+   pip install capellambse
 
 To set up a development environment, clone the project and install it into a
 virtual environment.
 
-.. code::
+.. code:: bash
 
-    git clone https://github.com/DSD-DBS/py-capellambse
-    cd capellambse
-    python -m venv .venv
+   git clone https://github.com/DSD-DBS/py-capellambse
+   cd capellambse
+   python -m venv .venv
 
-    source .venv/bin/activate.sh  # for Linux / Mac
-    .venv\Scripts\activate  # for Windows
+   source .venv/bin/activate.sh  # for Linux / Mac
+   .venv\Scripts\activate  # for Windows
 
-    pip install -U pip pre-commit
-    pip install -e '.[docs,test]'
-    pre-commit install
+   pip install -U pip pre-commit
+   pip install -e '.[docs,test]'
+   pre-commit install
 
 We recommend developing within a local `Jupyter notebook server`_ environment.
 In order to install and run it in the same virtual environment, execute the
 following additional commands:
 
-.. code::
+.. code:: bash
 
-     pip install jupyter capellambse
-     cd docs/source/examples
-     jupyter-notebook
+   pip install jupyter capellambse
+   cd docs/source/examples
+   jupyter-notebook
 
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 terminal to start it manually.