Centered logo README (#355)
Centered logo README (#355)

* Update design of README heading

* Remove old links

* Update slogan and paragraph

* Update slogan


Former-commit-id: aea08f5dc75695018f8ee14cb1101ccda265183c
amberframework/amber,amberframework/amber,amberframework/amber,Amber-Crystal/amber,Amber-Crystal/amber