This commit helps to make the README.md the main entry point into the
Ibex world. It does so by updating it and including additional
references to a style guide, a guide on how to write commit messages,
references to our Zulip chat and the original Zero-riscy paper.
This commit was prepared by the following script, followed by manual
fixes as needed.
```sh
sed -e 's/zeroriscy/ibex/g' -i.bak *.sv *.md *.yml
sed -e 's/zero-riscy/ibex/g' -i.bak *.sv *.md *.yml
sed -e 's/zeroriscy/ibex/g' -i.bak include/*.sv
sed -e 's/zero-riscy/ibex/g' -i.bak include/*.sv
sed -e 's/cluster_clock_gating/clock_gating/g' -i.bak *.sv
rm -f *.bak
rm -f include/*.bak
find . -name 'zeroriscy_*' -exec bash -c 'file={}; git mv $file ${file/zeroriscy/ibex}' \;
```