icons: Add svg for matrix, telegram and sourcehut

Modified colors from official svgs

Signed-off-by: baalajimaestro <me@baalajimaestro.me>
Change-Id: I9b0aaceddbb72f6eb2804108888e4c3876a12981

assets/icons/matrix.svg

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="currentColor" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round"><path d="M.632.55v22.9H2.28V24H0V0h2.28v.55zm7.043 7.26v1.157h.033c.309-.443.683-.784 1.117-1.024.433-.245.936-.365 1.5-.365.54 0 1.033.107 1.481.314.448.208.785.582 1.02 1.108.254-.374.6-.706 1.034-.992.434-.287.95-.43 1.546-.43.453 0 .872.056 1.26.167.388.11.716.286.993.53.276.245.489.559.646.951.152.392.23.863.23 1.417v5.728h-2.349V11.52c0-.286-.01-.559-.032-.812a1.755 1.755 0 0 0-.18-.66 1.106 1.106 0 0 0-.438-.448c-.194-.11-.457-.166-.785-.166-.332 0-.6.064-.803.189a1.38 1.38 0 0 0-.48.499 1.946 1.946 0 0 0-.231.696 5.56 5.56 0 0 0-.06.785v4.768h-2.35v-4.8c0-.254-.004-.503-.018-.752a2.074 2.074 0 0 0-.143-.688 1.052 1.052 0 0 0-.415-.503c-.194-.125-.476-.19-.854-.19-.111 0-.259.024-.439.074-.18.051-.36.143-.53.282-.171.138-.319.337-.439.595-.12.259-.18.6-.18 1.02v4.966H5.46V7.81zm15.693 15.64V.55H21.72V0H24v24h-2.28v-.55z"/></svg>

assets/icons/sourcehut.svg

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+<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
+    width="128" height="128">
+  <defs>
+    <filter id="shadow" x="-10%" y="-10%" width="125%" height="125%">
+      <feDropShadow dx="0" dy="0" stdDeviation="1.5"
+        flood-color="black" />
+    </filter>
+    <filter id="text-shadow" x="-10%" y="-10%" width="125%" height="125%">
+      <feDropShadow dx="0" dy="0" stdDeviation="1.5"
+        flood-color="#AAA" />
+    </filter>
+  </defs>
+  <circle cx="50%" cy="50%" r="38%" stroke="#878787" stroke-width="4%"
+    fill="none" filter="url(#shadow)" />
+  <circle cx="50%" cy="50%" r="38%" stroke="#878787" stroke-width="4%"
+    fill="none" filter="url(#shadow)" />
+</svg>

assets/icons/telegram.svg

@@ -0,0 +1 @@
+    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="22" y1="2" x2="11" y2="13"></line><polygon points="22 2 15 22 11 13 2 9 22 2"></polygon></svg>