feat: add markdown help on edit page rather than linking out

frontend/src/routes/edit/member/[id]/+page.svelte

@@ -39,6 +39,7 @@
   import { addToast, delToast } from "$lib/toast";
   import { memberNameRegex } from "$lib/api/regex";
   import { charCount, renderMarkdown } from "$lib/utils";
+  import MarkdownHelp from "../../MarkdownHelp.svelte";
 
   const MAX_AVATAR_BYTES = 1_000_000;
 
@@ -397,6 +398,7 @@
               static.
             </p>
             <p>
+              <!-- svelte-ignore a11y-invalid-attribute -->
               <a href="" on:click={() => (avatar = "")}>Remove avatar</a>
             </p>
           </div>
@@ -448,15 +450,8 @@
         Using {charCount(bio)}/{MAX_DESCRIPTION_LENGTH} characters
       </p>
       <p class="text-muted my-2">
-        <Icon name="info-circle-fill" aria-hidden /> Your bio supports limited
-        <a
-          class="text-reset"
-          href="https://commonmark.org/help/"
-          target="_blank"
-          rel="noopener noreferrer">Markdown</a
-        >.
+        <MarkdownHelp />
       </p>
-      <hr />
       {#if bio}
         <hr />
         <Card>