development stats for time periods

Hi!

The first half of 2025 is coming to a close and I suspect some companies are working through employee performance reviews.

Our development stats are are bit awkward to use for performance reviews because release cycles don't align with 6mo or 12mo windows. I added a cron job to generate the development stats each weekend for the last X months:
https://netdev.bots.linux.dev/static/nipa/stats-1mo/
https://netdev.bots.linux.dev/static/nipa/stats-3mo/
https://netdev.bots.linux.dev/static/nipa/stats-6mo/
https://netdev.bots.linux.dev/static/nipa/stats-12mo/
This should hopefully make it easier to claim credit for upstream work.

HTH