Add PDF export functionality and favicon support

- Introduced a new script for exporting the dashboard as a PDF using html2canvas and jsPDF.
- Added a favicon.ico file and linked it in the base template.
- Updated the base template to include the new PDF export script and modified the button for PDF export functionality.
- Enhanced the index template to include an ID for the dashboard content for PDF generation.

templates/index.html

@@ -10,7 +10,7 @@
 
 {% block content %}
 <!-- MAIN DASHBOARD -->
-<div class="p-4 space-y-8" {% if skeleton %}data-dashboard="skeleton"{% endif %}>
+<div id="dashboard-content" class="p-4 space-y-8" {% if skeleton %}data-dashboard="skeleton"{% endif %}>
     <!-- QUICK STATS ROW -->
     <section class="grid grid-cols-1 lg:grid-cols-3 gap-4" aria-label="Quick stats">
         <!-- CPU Utilization -->