Remove notes of Priority Inbox on Dashboard

[underyx]

Thanks for improving Semgrep Docs 😀

Please ensure

• [ ] A subject matter expert (SME) reviews the content
• [ ] A technical writer reviews the content or PR
• [ ] This change has no security implications or else you have pinged the security team
• [ ] Redirects are added if the PR changes page URLs
• [ ] If you have changed any header tag links (doc/#this-kind-of-anchor), update all instances of that link

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[s-santillan]

@underyx This is still true of the non-beta dashboard though? How about I merge when we're GA with the new dash?

[s-santillan]

Removing priority inbox for now (take note of the date) but it may come back in the future in some form