add favicons

site/static/favicons/browserconfig.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square150x150logo src="/mstile-150x150.png"/>
+            <TileColor>#da532c</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>

site/static/favicons/safari-pinned-tab.svg

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+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
+ "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg version="1.0" xmlns="http://www.w3.org/2000/svg"
+ width="70.000000pt" height="70.000000pt" viewBox="0 0 70.000000 70.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.11, written by Peter Selinger 2001-2013
+</metadata>
+<g transform="translate(0.000000,70.000000) scale(0.100000,-0.100000)"
+fill="#000000" stroke="none">
+<path d="M22 682 c-20 -17 -20 -29 -20 -332 0 -309 0 -313 21 -331 20 -16 50
+-18 330 -18 284 0 310 2 326 18 17 17 18 43 19 329 0 255 -2 313 -14 323 -7 6
+-12 15 -9 19 3 4 -139 8 -314 8 -290 1 -321 -1 -339 -16z"/>
+</g>
+</svg>

site/static/favicons/site.webmanifest

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+{
+    "name": "",
+    "short_name": "",
+    "icons": [
+        {
+            "src": "/android-chrome-48x48.png",
+            "sizes": "48x48",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#ffffff",
+    "background_color": "#ffffff",
+    "display": "standalone"
+}