Update README as there is some old stuff there and also remove some very specific use-case plugins (like vim-sync and Asyncrun which is a dependency, maybe colorizer plugin too).
Particularly important thing to add to README: how to change / pick spefic version / branch of Sigma (as I might leave a legacy branch that keeps the original plugin set).
Update README as there is some old stuff there and also remove some very specific use-case plugins (like vim-sync and Asyncrun which is a dependency, maybe colorizer plugin too).