Clear out directory after docs build and remove stale previews - #1300

Clear out directory after docs build and remove stale previews#1300

efaulhaber wants to merge 4 commits into

trixi-framework:maintrixi-framework/TrixiParticles.jl:mainfrom

efaulhaber:docs-clear-outdirefaulhaber/TrixiParticles.jl:docs-clear-outdirCopy head branch name to clipboard