Refactoring part 1

Some changes for workers, but stopped due to refactoring

eveai_app/templates/error/500.html

@@ -0,0 +1,9 @@
+{% extends "base.html" %}
+
+{% block title %}Error 500{% endblock %}
+
+{% block content_title %}Internal Server error{% endblock %}
+{% block content_description %}Something unexpected happened! The administrator has been notified.{% endblock %}
+{% block content %}
+    <p><a href="{{ url_for('basic_bp.index') }}">Return home</a></p>
+{% endblock %}