[Doc] Update developer install doc to use setup.py. (#2706)
[Doc] Update developer install doc to use setup.py. (#2706)

* [Doc] Update developer install doc to use setup.py.

* Auto Format

* resolve comments.

* Resolve comments.

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