Add EVM version color coding in the opcodes table

[assimovt]

For example:

• Remove the group column, color code it instead with a legend somewhere else
• Color code per version of ethereum

[assimovt]

Couple of questions here:

1. Where would you like to put the group column? Somewhere else? ;)
2. Do you want to color code the opcodes in which fork they have been introduced? For example, there are all opcodes, but then additional ones added in various forks (speced here: https://github.com/ethereumjs/ethereumjs-monorepo/blob/master/packages/vm/src/evm/opcodes/codes.ts#L197) Would it be enough to show these added ones and their associated hard fork?

[peroket]

• I think we can just remove the group column, and we will just display it in their own dedicated page
• I guess yes you can add a small column to show those, that link is not complete though, it's missing BASEFEE for example (available from London), so maybe you can just hardcode it from the current https://evm.codes/. By the way, BASEFEE has no descriptions, how come?