Website: Fix discord links

[MartinKong1990]

trafficstars

Old: https://discord.io/EthCatHerders

New: https://discord.com/invite/Nz6rtfJ8Cu

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[eth-bot]

File index.html

Requires 1 more reviewers from @axic, @gcolvin, @lightclient, @samwilsn

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[MartinKong1990]

Requires 1 more reviewers from @axic, @gcolvin, @lightclient, @SamWilsn