accounts: share telegram linking modal with other pages

the one on the admin page was a little messed up anyway. Not relevant to
the other linking modals, as the process is different (simpler) on the
admin page.

html/account-linking-telegram.html

@@ -0,0 +1,18 @@
+{{ if .telegramEnabled }}
+<div id="modal-telegram" class="modal">
+    <div class="card relative mx-auto my-[10%] w-4/5 lg:w-1/3">
+        <span class="heading mb-4">{{ .strings.linkTelegram }}</span>
+        <p class="content mb-4">{{ .strings.sendPIN }}</p>
+        <p class="text-center text-2xl mb-2 pin"></p>
+        <a class="subheading link link-center" href="{{ .telegramURL }}" target="_blank">
+            <span class="shield ~info mr-4">
+                <span class="icon">
+                    <i class="ri-telegram-line"></i>
+                </span>
+            </span>
+            &#64;<span class="username">{{ .telegramUsername }}</span>
+        </a>
+        <span class="button ~info @low full-width center mt-4" id="telegram-waiting">{{ .strings.success }}</span>
+    </div>
+</div>
+{{ end }}