feat: add new installation guide, move to docs/

docs/icons/browserconfig.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square70x70logo src="./mstile-70x70.png"/>
+            <square150x150logo src="./mstile-150x150.png"/>
+            <square310x310logo src="./mstile-310x310.png"/>
+            <wide310x150logo src="./mstile-310x150.png"/>
+            <TileColor>#00aba9</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>

docs/icons/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="512.000000pt" height="512.000000pt" viewBox="0 0 512.000000 512.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.11, written by Peter Selinger 2001-2013
+</metadata>
+<g transform="translate(0.000000,512.000000) scale(0.100000,-0.100000)"
+fill="#000000" stroke="none">
+<path d="M2378 5115 c-2 -1 -30 -5 -63 -9 -33 -3 -71 -8 -85 -10 -14 -3 -61
+-10 -105 -16 -239 -35 -599 -163 -835 -297 -479 -273 -886 -735 -1095 -1243
+-52 -128 -115 -324 -129 -400 -2 -14 -7 -36 -10 -50 -44 -190 -65 -557 -44
+-780 39 -410 195 -841 429 -1185 303 -446 735 -784 1239 -968 111 -41 310 -97
+395 -111 226 -38 248 -40 480 -41 275 0 380 12 635 76 233 59 453 147 643 258
+43 25 85 51 95 56 46 27 151 103 239 174 523 418 866 1043 940 1716 13 116 9
+511 -6 600 -49 295 -96 465 -194 693 -194 456 -557 879 -982 1146 -152 96
+-423 226 -520 250 -5 2 -18 6 -27 9 -37 14 -54 20 -83 27 -16 5 -73 20 -125
+33 -174 47 -356 69 -582 72 -113 2 -208 2 -210 0z"/>
+</g>
+</svg>

docs/icons/site.webmanifest

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