Update documentation terminology to "API Documentation" (#82)

Renamed the documentation section to "API Documentation" or "API Docs" for consistency and clarity:
- Changed title in `index.md` from "Documentation" to "API Documentation".
- Updated label in `root.tmpl.partial` from "Docs" to "API Docs".
- Modified section name in `toc.yml` from "Documentation" to "API Docs".

Author: KubaZ2

Documentation/docs/index.md

@@ -2,6 +2,6 @@
 canonicalPath: [ "docs/" ]
 ---
 
-# Documentation
+# API Documentation
 
 You can find information about all NetCord objects here.

Documentation/templates-src/NetCord/partials/root.tmpl.partial

@@ -4,7 +4,7 @@
   <section class="buttons">
     <a href="guides/getting-started/installation.html" class="button primary-button">Get Started</a>
     <a href="guides/getting-started/installation.html" class="button secondary-button">Guides</a>
-    <a href="docs/" class="button secondary-button">Docs</a>
+    <a href="docs/" class="button secondary-button">API Docs</a>
   </section>
 </div>
 

Documentation/toc.yml

@@ -1,5 +1,5 @@
 - name: Guides
   href: guides/
-- name: Documentation
+- name: API Docs
   href: docs/
   homepage: docs/