Initial Setup

Re-worked to support my Gitea environment, along with some other customizations
and removals.

Currently based off of their `silverblue-main` base image, with 1Password and
Tailscale layered.

.markdownlint.json

@@ -0,0 +1,8 @@
+{
+  "line-length": {
+    "tables": false
+  },
+  "no-inline-html": {
+    "allowed_elements": ["abbr", "pre", "kbd", "samp"]
+  }
+}