use flask flash for notifications

templates/workspaces/projects/new.html

@@ -8,14 +8,7 @@
 {% block workspace_content %}
 
   {% set modalName = "newProjectConfirmation" %}
-  {% if request.args.get("newWorkspace") %}
-    {{ Alert('Workspace created!',
-      message="\
-        <p>You are now ready to create projects and environments within the JEDI Cloud.</p>
-      ",
-      level='success'
-    ) }}
-  {% endif %}
+  {% include "fragments/flash.html" %}
 
   <new-project inline-template v-bind:initial-data='{{ form.data|tojson }}' modal-name='{{ modalName }}'>
     <form method="POST" action="{{ url_for('workspaces.create_project', workspace_id=workspace.id) }}" v-on:submit="handleSubmit">