Improved: Have a readme in every component (OFBIZ-6243)

Not sure why we have this problem (according to
https://docs.github.com/en/github/authenticating-to-github/about-anonymized-image-urls
could be to missing cache control in our site server)

As I was fed up not viewing the OFBIz logo anywhere, and mostly in GH,
but just in browser at https://ofbiz.apache.org/images/ofbiz_logo.png
and I noticed I was viewing it well locally at
https://github.com/apache/ofbiz-framework/tree/trunk/themes/rainbowstone
so decided to use this URL everywhere rather!
10 files changed