Tweak theme

themes/custom-theme/static/browserconfig.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square150x150logo src="/mstile-150x150.png"/>
+            <TileColor>#282828</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>

themes/custom-theme/static/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="700.000000pt" height="700.000000pt" viewBox="0 0 700.000000 700.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.14, written by Peter Selinger 2001-2017
+</metadata>
+<g transform="translate(0.000000,700.000000) scale(0.100000,-0.100000)"
+fill="#000000" stroke="none">
+<path d="M3500 6701 l0 -299 -22 -6 c-13 -3 -91 -6 -175 -6 -339 0 -647 -72
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+</g>
+</svg>

themes/custom-theme/static/site.webmanifest

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+{
+    "name": "hugo-theme-gruvbox",
+    "short_name": "hugo-theme-gruvbox",
+    "icons": [
+        {
+            "src": "/android-chrome-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "/android-chrome-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#282828",
+    "background_color": "#282828",
+    "display": "standalone"
+}