tracker: single-binary project tracker with auth, api keys, and json api

Go + SQLite web app, server-rendered, hackerman theme. Projects with
descriptions, searchable notes, todo/doing/done task tracking. Bcrypt
login sessions, hashed api keys, full /api/v1 crud. Deploys on straylight
via configs/tracker.nix (prebuilt binary).

internal/server/templates/error.html

@@ -0,0 +1,9 @@
+{{template "header" .}}
+
+<section class="panel">
+  <h1 class="glow">// error {{.Status}}</h1>
+  <p class="description">{{.Message}}</p>
+  <p><a class="btn" href="/">◂ back to base</a></p>
+</section>
+
+{{template "footer" .}}