docs: wire the MkDocs theme to the new open_pg_tde logo

Replace the placeholder mammoth logo and favicon with the new brand assets: the
white mark for the header (which sits on the Command Prompt blue), the SVG
favicon, and the color mark on the PDF cover page. Also refresh the stale
version on the PDF cover.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: OffgridwithJD

documentation/docs/templates/pdf_cover_page.tpl

@@ -1,10 +1,10 @@
 <!--<h1>'{{ config.site_name }}'</h1>-->
 {{ config.extra.added_key }}
 <p>
-<img src="_images/mammoth.png" />
+<img src="_images/open_pg_tde-logo/png/open_pg_tde-mark-256.png" />
 </p>
 <h1>open_pg_tde: Transparent Data Encryption for PostgreSQL</h1>
 {% if config.site_description %}
 <h1>{{ config.site_description }}</h1>
 {% endif %}
-<h2> 2.2.1 (2026-07-06)</h2>
+<h2> 2.3.0 </h2>

documentation/mkdocs.yml

@@ -15,8 +15,8 @@ use_directory_urls: false
 # Theme settings
 theme:
   name: material
-  logo: _images/mammoth.png
-  favicon: _images/mammoth-48.png
+  logo: _images/open_pg_tde-logo/mark/icon-white.svg
+  favicon: _images/open_pg_tde-logo/favicon/favicon.svg
   font:
     text: Work Sans
   palette: