gfmpw-1 issues.

[gonsolo]

There is not a single testbench for gfmpw-1c!

1. verilog/dv/README.md is an empty file
2. verilog/dv is empty except for the empty README.md; no testbenches, no tests.
3. make setup fails with "can't cd to verilog/dv/cocotb"
4. make setup warnings about CARAVEL_NAME, CARAVEL_TAG, CARAVEL_REPO. It seems index.rst is wrong about exporting OPENLANE_ROOT PDK_ROOT AND PDK.
5. index.rst refers to gfmpw-0d. Should this be gfmpw-1b?
6. There is a tag gfmpw-1c. Should this be used instead of gfmpw-1b?
7. "python3 -m pip install --upgrade volare" fails with "error: externally-managed-environment" on Ubuntu.

[d-m-bailey]

#328 fixes 3. above

[bman12three4]

I had a similar issue to 7 on gentoo, I created a virtual environment before running make setup and that seems to work.