feat(design): nav anchor links, hidden services flag, drop badges

Add projects/journey/homelab anchor links to sticky nav for in-page
navigation. Add hidden flag to services data — hidden entries count
toward total but don't render. Remove badge counts from all widgets.

src/components/Nav.astro

@@ -2,13 +2,19 @@
   <nav class="max-w-[740px] mx-auto px-4ch h-11 flex items-center justify-between">
     <a href="/" class="font-semibold">Tyler Koenig</a>
 
-    <button
+    <div class="flex items-center gap-2ch">
+      <a href="#projects" class="text-[var(--color-text-label)] hover:text-[var(--color-text)]">projects</a>
+      <a href="#journey" class="text-[var(--color-text-label)] hover:text-[var(--color-text)]">journey</a>
+      <a href="#homelab" class="text-[var(--color-text-label)] hover:text-[var(--color-text)]">homelab</a>
+
+      <button
       data-theme-toggle
       aria-label="Switch to light mode"
       class="text-[var(--color-text-label)] hover:text-[var(--color-text)] cursor-pointer"
     >
-      light
-    </button>
+        light
+      </button>
+    </div>
   </nav>
 </header>