feat(docs): ✨ add requirements.txt and update mkdocs.yml configuration

* Introduced `requirements.txt` to specify dependencies.
* Updated `mkdocs.yml` to enhance navigation structure and include plugins.

Author: HeyItsGilbert

docs/requirements.txt

@@ -0,0 +1 @@
+mkdocs-include-dir-to-nav

mkdocs.yml

@@ -1,4 +1,12 @@
 site_name: PesterExplorer
+site_url: http://heyitsgilbert.github.io/PesterExplorer
 repo_url: http://github.com/HeyItsGilbert/PesterExplorer
 theme: readthedocs
-
+nav:
+  - Home: "index.md"
+  - Changelog: "https://github.com/HeyItsGilbert/PesterExplorer/blob/main/CHANGELOG.md"
+  - en-US:
+      - en-US/
+plugins:
+  - search
+  - include_dir_to_nav