Fix README typos and broken links

Author: GOB52

README.md

@@ -162,5 +162,4 @@ If you want to output Git commit hashes to html, do it for the git cloned folder
 
 ### Required
 - [Doxygen](https://www.doxygen.nl/)
-- [pcregrep](https://formulae.brew.sh/formula/pcre2)
 - [Git](https://git-scm.com/) (Output commit hash to html)