wip: rename branch to main

[leogr]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind user-interface

/kind content

/kind event

Any specific area of the project related to this PR?

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/area blog

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/area community

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #1101

Special notes for your reviewer:

Once this is merged, we have to update the manually the Production branch on Netlify

We will need to update the protected branch to https://github.com/falcosecurity/test-infra/blob/master/config/config.yaml

[poiana]

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