[Doc] Installation with mirror source (#2946)
[Doc] Installation with mirror source (#2946)

* Installation with mirror source

* Auto Format

* Update install.md

Co-authored-by: Taichi Gardener <52844ac7498fba84f633481a7c3ae54491811c81@gmail.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi