Update README.md for Cumulus (#7930)
Remove references to Rococo. Add relevant information for Paseo and
Westend testnets
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Co-authored-by: 
Bastian Köcher <git@kchr.de>
parent
d1cf73a3
Remove references to Rococo. Add relevant information for Paseo and
Westend testnets
---------
Co-authored-by: Bastian Köcher <git@kchr.de>