fix: add project link on onboarding page (#236)

* fix: add link to project on onboarding page

* fix: open project link in a new tab

* fix: add tags noopener & noreferrer for security

Apply sourcery recommandation

web/dashboard/templates/dashboard/onboarding.html

@@ -18,7 +18,7 @@
               <div class="card bg-pattern">
                 <div class="card-body p-4">
                   <h3 class="text-center">Hey {{user.username}}! Welcome to reNgine-ng</h3>
-                  <p>You will need to create your first project before you start using reNgine-ng. Projects are now a part of reNgine-ng 2.0! <a href="#">Learn more about projects.</a></p>
+                  <p>You will need to create your first project before you start using reNgine-ng. Projects are now a part of reNgine-ng 2.0! <a href="https://github.com/Security-Tools-Alliance/rengine-ng/wiki/usage-projects" target="_blank" rel="noopener noreferrer">Learn more about projects.</a></p>
                   {% if error %}
                   <div class="alert alert-danger">
                     {{error}}