fix: better libp2p link on /community page

[lidel]

I think linking to Google Calendar is not the best use of the space. This PR changes it to "Learn more" and https://libp2p.io/#community which includes not only info about libp2p calendar, implementers meeting, but also link to discussion forums etc.

cc @mxinden if there is a better link libp2p team would like to see at https://ipfs.tech/community/#meetups-wgs

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[cwaring]

Works for me. Thanks!