Fix navbar showing long SEO titles

- Add nav_title field for short navigation labels
- Update navbar to use nav_title with fallback to title

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: behas

_includes/navbar.html

@@ -14,7 +14,8 @@
         {%- for path in page_paths -%}
           {%- assign my_page = site.pages | where: "path", path | first -%}
           {%- if my_page.title -%}
-          {% include navitem.html title=my_page.title url=my_page.url %}
+            {%- assign nav_title = my_page.nav_title | default: my_page.title -%}
+            {% include navitem.html title=nav_title url=my_page.url %}
           {%- endif -%}
         {% endfor -%}
         {% include navitem.html title="On Github" url=site.repo icon="fab fa-github" %}

index.md

@@ -1,6 +1,7 @@
 ---
 layout: home
 title: GraphSense - Open Source Cryptoasset Analytics
+nav_title: Home
 description: GraphSense is an open-source cryptoasset analytics platform for Bitcoin, Ethereum, and Tron. Full data sovereignty, algorithmic transparency, and scalability.
 ---
 

news.md

@@ -1,6 +1,7 @@
 ---
 layout: page
 title: News & Releases
+nav_title: News
 description: Latest GraphSense releases, updates, and announcements. Stay informed about new features, supported cryptocurrencies, and platform improvements.
 ---