add BTC donation address

src/views/HelpView.vue

@@ -366,6 +366,26 @@
         </a>
       </p>
 
+      <h2 class="text-xl font-semibold">How can I contribute?</h2>
+      <p>
+        If you have skills, contact us below.
+        If you have Bitcoin, donate to
+        <button
+          @click="
+            doCopyTwoSecRedo(
+              'bc1q90v4ted6cpt63tjfh2lvd5xzfc67sd4g9w8xma',
+              () => (showDidCopy = !showDidCopy)
+            )
+          "
+          class="text-blue-500 ml-2"
+        >
+          bc1q90v4ted6cpt63tjfh2lvd5xzfc67sd4g9w8xma
+          <fa icon="copy" class="text-slate-400 fa-fw"></fa>
+        </button>
+        <span v-show="showDidCopy">Copied</span>
+        For other donations, contact us.
+      </p>
+
       <h2 class="text-xl font-semibold">Where can I read more?</h2>
       <p>
         This is part of the
@@ -379,7 +399,7 @@
       <p>{{ package.version }} ({{ commitHash }})</p>
 
       <h2 class="text-xl font-semibold">
-        For any other questions, including removing all your data from the public ledger:
+        For any other questions, including getting on or removing all your data from the public ledger:
       </h2>
       <p>
         Contact us at
@@ -394,6 +414,7 @@
 
 <script lang="ts">
 import { Component, Vue } from "vue-facing-decorator";
+import { useClipboard } from "@vueuse/core";
 
 import * as Package from "../../package.json";
 import QuickNav from "@/components/QuickNav.vue";
@@ -405,5 +426,14 @@ export default class Help extends Vue {
 
   package = Package;
   commitHash = import.meta.env.VITE_GIT_HASH;
+  showDidCopy = false;
+
+  // call fn, copy text to the clipboard, then redo fn after 2 seconds
+  doCopyTwoSecRedo(text: string, fn: () => void) {
+    fn();
+    useClipboard()
+      .copy(text)
+      .then(() => setTimeout(fn, 2000));
+  }
 }
 </script>