refactor: convert config symlink to empty file for Forestry
refactor: convert config symlink to empty file for Forestry

Otherwise, Windows 10 users must either enable Developer mode or run
git clone with admin privileges as well as using the special
`git clone -c core.symlinks=true https://...` command.

xuebinsu/xuebinsu.github.io,MrPike/Pike.im,emilioj/homepage,sebastian-claici/sebastian-claici.github.io,MrPike/Pike.im,artivis/artivis.github.io,MrPike/Pike.im,WenxuanZhang/WenxuanZhang.github.io,tmquan/tmquan.github.io,tmquan/tmquan.github.io,WenxuanZhang/WenxuanZhang.github.io