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Remove unhelpful OpenGraph previews (Slack link unfurling)

Created by: sqs

When you paste a Sourcegraph link into Slack, it shows a generic OpenGraph link unfurl:

image

I think the ideal behavior is:

  • If you link to the homepage (the / path on a Sourcegraph instance), it should show this generic description.
  • The default for all other paths is NO OpenGraph preview, so pasting the URL into Slack/Twitter shows no unfurl.
  • There still should be a search engine meta description, though, for all pages.
  • In the future, we can add nice OpenGraph previews for certain pages, but this is not a priority because most customer instances do not currently show OpenGraph previews because Slack is not able to access their instance (due to it being protected). I.e., this is really only a problem for Sourcegraph.com now.