docs: add nix syntax highlighting

docs/src/contributing.md

@@ -48,7 +48,7 @@ Unit tests can be executed via `nix run .#tests-unit`
 
 Add an example flake under `./examples/name-of-example`.
 The flake can be tested via:
-```command
+```shell
 nix run .#tests-examples name-of-example --show-trace
 ```
 The flake will be tested in the CI-pipeline as well.
@@ -72,7 +72,7 @@ Further instructions are contained in the template in form of code comments.
 
 Add an example flake under `./examples/name-of-example`.
 The flake can be tested via:
-```command
+```shell
 nix run .#tests-examples name-of-example --show-trace
 ```
 The flake will be tested in the CI-pipeline as well.

docs/src/extending-dream2nix.md

@@ -14,7 +14,7 @@ dream2nix.lib.init {
 ```
 this file should look like this:
 ```nix
-{dlib, lib, config, ...}:
+{ dlib, lib, config, ... }:
 {
   subsystems.rust.translators.example-translator = ./rust-translator.nix;
   # you can declare modules using functions here

docs/src/intro/architectural-considerations.md

@@ -114,7 +114,7 @@ Poetry uses `pyproject.toml` and `poetry.lock` to lock dependencies
 - Input: pyproject.toml, poetry.lock (toml)
 - Translator: written in pure nix, reading the toml input and generating the generic lock format
 - Generic Lock (for explanatory purposes dumped to json and commented):
-    ```json5
+    ```json
     {
       // generic lock format version
       "version": 1,

docs/src/subsystems/python.md

@@ -17,7 +17,7 @@ This translator simply executes `pip download` on the given source and observes
 The downside of this approach is, that this translator cannot be used with a granular builder. It does not understand the exact relation between the dependencies, and therefore it only allows to build all dependencies in one large derivation.
 
 #### **pip** optional translator arguments
-```
+```nix
 {{#include ../../../src/subsystems/python/translators/pip/args.nix}}
 ```