Create clean_repo.md

IntegerMan · Mar 15, 2020 · ae051a4 · ae051a4
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+ensure latest bfg is in this folder, named bfg.jar
+
+create a mirror (don't run bfg on existing clones)
+```
+git clone --mirror https://github.com/swharden/ScottPlot.git
+```
+
+remove all folders named "images" from the history
+```
+java -jar bfg.jar --delete-folders "images" ScottPlot.git
+```
+
+clean up
+```
+cd ScottPlot.git
+git reflog expire --expire=now --all
+git gc --prune=now --aggressive
+```