Added new helpfile (just for testing purposes)

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+<h1>Grades aggregation</h1>
+
+<p>By clicking at <strong>Re-calculate grades</strong>, the grades for submission, grades for assessment and
+total grades will be aggregated and updated in the workshop database.</p>
+
+<p>The aggregated grade for submission is calculated as a weighted mean of grades as given by peers. Eventually,
+workshop moderators (like teachers or similar roles) can override such computed grades and set the grade manually.</p>
+
+... (todo be continued)