Simplify favicon

Makefile

@@ -5,3 +5,8 @@ fmt:
 
 vet:
 	go vet ./...
+
+favicons:
+	convert -background none assets/favicons/favicon.svg -resize 16x16 assets/favicons/favicon-16.png
+	convert -background none assets/favicons/favicon.svg -resize 32x32 assets/favicons/favicon-32.png
+	convert -background none assets/favicons/favicon.svg -resize 180x180 assets/favicons/favicon-180.png

assets/favicons/favicon.svg

@@ -8,6 +8,8 @@
    version="1.1"
    id="svg5"
    xml:space="preserve"
+   sodipodi:docname="favicon.svg"
+   inkscape:version="1.3 (0e150ed6c4, 2023-07-21)"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns="http://www.w3.org/2000/svg"
@@ -21,14 +23,23 @@
      inkscape:pagecheckerboard="0"
      inkscape:deskcolor="#d1d1d1"
      inkscape:document-units="mm"
-     showgrid="false" /><defs
+     showgrid="false"
+     inkscape:zoom="0.82617197"
+     inkscape:cx="511.99994"
+     inkscape:cy="511.99994"
+     inkscape:window-width="1920"
+     inkscape:window-height="1052"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1" /><defs
      id="defs2"><filter
        style="color-interpolation-filters:sRGB"
        inkscape:label="Drop Shadow"
        id="filter6175"
-       x="-0.30888888"
+       x="-0.30888889"
        y="-0.27799866"
-       width="1.6622221"
+       width="1.6622222"
        height="1.5759987"><feFlood
          flood-opacity="0.4"
          flood-color="rgb(0,0,0)"
@@ -65,7 +76,4 @@
        transform="matrix(6.364052,0,0,6.364052,59.098043,59.097958)"><path
          d="m 3,9 9,-7 9,7 v 11 a 2,2 0 0 1 -2,2 H 5 A 2,2 0 0 1 3,20 Z"
          id="path5080"
-         style="stroke:#ffffff;stroke-opacity:1" /><polyline
-         points="9 22 9 12 15 12 15 22"
-         id="polyline5082"
-         style="stroke:#ffffff;stroke-opacity:1" /></g></g></svg>
+         style="stroke:#ffffff;stroke-opacity:1;stroke-width:3.14265188;stroke-dasharray:none" /></g></g></svg>