fix(website): correct external nav link targets (#5028)

The target attributes in the website header were using curly quotes
instead of normal ones which made the new tab behavior broken (both
links would open in the same new tab).

Author: ashmod

gcp/website/frontend3/src/base.html

@@ -62,10 +62,10 @@
           <a href="{{ url_for('frontend_handlers.blog') }}">Blog</a>
         </li>
         <li class="{{ 'active' if active_section == 'faq' else '' }} page-link external-link">
-          <a href="https://google.github.io/osv.dev/faq/" target=”_blank” >FAQ</a>
+          <a href="https://google.github.io/osv.dev/faq/" target="_blank">FAQ</a>
         </li>
         <li class="{{ 'active' if active_section == 'docs' else '' }} page-link external-link">
-          <a href="https://google.github.io/osv.dev/" target=”_blank” >Docs</a>
+          <a href="https://google.github.io/osv.dev/" target="_blank">Docs</a>
         </li>
 
         <ul class="push social-icons">