Add reference to the new website when possible in the README.md
Add reference to the new website when possible in the README.md

xasx/assertj-core,assertj/assertj-core,hazendaz/assertj-core,joel-costigliola/assertj-core,joel-costigliola/assertj-core,xasx/assertj-core,hazendaz/assertj-core,assertj/assertj-core