feat: add favicons for all three sites

flux.vision/flux/static/img/favicon.svg

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 100 100"
+   version="1.1"
+   id="svg1"
+   sodipodi:docname="favicon.svg"
+   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
+   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"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#cccccc"
+     borderopacity="1"
+     inkscape:showpageshadow="0"
+     inkscape:pageopacity="1"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="6.09"
+     inkscape:cx="50.082102"
+     inkscape:cy="50"
+     inkscape:window-width="1536"
+     inkscape:window-height="891"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg1" />
+  <rect
+     width="100"
+     height="100"
+     fill="#000000"
+     id="rect1" />
+  <path
+     style="font-style:italic;font-size:76px;font-family:inter;-inkscape-font-specification:'inter Italic';text-anchor:middle;fill:#ffffff;stroke-width:1.36969"
+     d="M 36.981314,89.544329 47.197779,27.737255 q 0.914908,-5.540272 3.303833,-9.403215 2.388924,-3.862942 6.099382,-5.845241 3.710457,-2.033128 8.488306,-2.033128 6.455181,0 10.775576,3.557973 4.371224,3.507145 6.099383,9.911497 1.728158,6.353522 0.304969,14.84183 -1.67733,10.013153 -6.810977,16.874958 -5.082819,6.861804 -12.961188,10.368949 -7.827539,3.507145 -17.739037,3.507145 h -1.270704 q -9.454043,0 -15.756737,-3.608801 -6.302696,-3.65963 -8.945761,-10.267293 -2.643066,-6.658493 -1.169049,-15.604254 1.11822,-6.70932 4.21874,-12.707045 3.100519,-5.997727 7.725884,-10.318122 4.676194,-4.320396 10.470607,-5.89607 l 1.067391,7.827541 q -3.557973,0.965735 -6.455179,3.710457 -2.897207,2.693894 -4.879506,6.861805 -1.931471,4.167912 -2.846378,9.555699 -1.219877,7.522572 0.457453,12.452905 1.728159,4.930335 6.150211,7.370088 4.472881,2.439753 11.385514,2.439753 h 1.219876 q 7.624228,0 13.1645,-2.338098 5.5911,-2.388924 9.047416,-7.370086 3.456318,-5.03199 4.777851,-12.910359 0.965735,-5.794413 0.355796,-10.318121 -0.609937,-4.52371 -2.846378,-7.115947 -2.185612,-2.643065 -6.099382,-2.643065 -2.185612,0 -3.812114,0.914906 -1.626502,0.86408 -2.693894,2.592238 -1.016563,1.677331 -1.423189,4.167911 L 46.130388,89.544329 Z"
+     id="text1"
+     aria-label="φ" />
+</svg>