Use the app icon as the web favicon and landing logo

RecipesCamIcon.png (scaled to 256px) becomes favicon + apple-touch-icon and
replaces the drawn camera svg in front of the landing wordmark, which now sits
a touch closer to it.

docker/frontend/src/Landing.tsx

@@ -142,10 +142,7 @@ export function Landing() {
       <nav className="lp-nav">
         <div className="lp-wrap">
           <a className="lp-logo" href="#top" onClick={() => setMenu(false)}>
-            <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.7" strokeLinejoin="round">
-              <path d="M3 8a2 2 0 0 1 2-2h2l1.4-2h7.2L17 6h2a2 2 0 0 1 2 2v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2Z" />
-              <circle cx="12" cy="12.5" r="3.4" />
-            </svg>
+            <img className="lp-logo-mark" src="/assets/RecipesCamIcon.png" alt="" width="22" height="22" />
             Recipes<em>Cam</em>
           </a>
           <div className="lp-nav-links">