Add script: merged PR count per author aggregated by week over the past year (#97)

* Initial plan

* Add notebook: GitHub merged PR stats by person, aggregated by week

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* Support a list of repos in github_stat_pr notebook

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* Add per-repo CSV cache to github_stat_pr notebook

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* Add AUTHOR_WHITELIST param and remove repo names from chart titles

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* Add per-repo bar chart and heatmap visualizations

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* Replace notebook with standalone Python script that saves PNG images

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* fix

* author

* Add line chart comparing weekly PR counts across repos

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* Fix lines chart to aggregate all authors per repo (unfiltered by whitelist)

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* clean

* fix

* fix

---------

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Author: Copilot

.gitignore

@@ -20,6 +20,7 @@ lisezmoi*
 dummy*
 exemple.txt
 examen*.csv
+prs*.csv
 fleurs.csv
 *dbase*
 .eggs/*