Add base files for new Jekyll site setup

Introduced initial setup for a Jekyll-based site, including configurations, layouts, assets, and styles. Added custom 404 page, favicon assets, SCSS themes, fonts, and a blog post template to establish the foundation for the site.

_data/menus.yml

@@ -0,0 +1,19 @@
+- title: home
+  url: /
+  external: false
+
+- title: archive
+  url: /archive/
+  external: false
+
+- title: about
+  url: /about/
+  external: false
+
+- title: github
+  url: https://github.com/elyday
+  external: true
+
+- title: git
+  url: https://git.techturtle.de/elyday
+  external: true