chore: use example files as examples

examples/dotfiles/.yamllint.yaml

@@ -0,0 +1,10 @@
+---
+# See https://yamllint.readthedocs.io/en/stable/configuration.html for
+# more information
+
+extends: default
+
+rules:
+  line-length:
+    allow-non-breakable-inline-mappings: true
+    max: 120

knowledge base/yamllint.md

@@ -54,6 +54,8 @@ extends: relaxed
     indent-sequences: whatever
 ```
 
+[Configuration file example].
+
 ## Further readings
 
 - [GitHub] page
@@ -68,3 +70,6 @@ extends: relaxed
 [documentation]: https://yamllint.readthedocs.io/en/stable
 [github]: https://github.com/adrienverge/yamllint
 [rules]: https://yamllint.readthedocs.io/en/stable/rules.html
+
+<!-- Files -->
+[configuration file example]: ../examples/dotfiles/.yamllint.yaml