"Spell-Jacking" mitigation ~ prevent sensitive data leak from spell checker.

@see https://www.otto-js.com/news/article/chrome-and-edge-enhanced-spellcheck-features-expose-pii-even-your-passwords

src/static/templates/admin/users.hbs

@@ -96,7 +96,7 @@
             <small>Email:</small>
 
             <form class="form-inline input-group w-50" id="inviteUserForm">
-                <input type="email" class="form-control me-2" id="inviteEmail" placeholder="Enter email" required>
+                <input type="email" class="form-control me-2" id="inviteEmail" placeholder="Enter email" required spellcheck="false">
                 <button type="submit" class="btn btn-primary">Invite</button>
             </form>
         </div>