ci: make linkcheck 2 times faster

[wtchnm]

What kind of changes does this PR include?

• Something else!

Description

It makes the lint:linkcheck command run 2 times faster by disabling OG image generation.

Local

CI

Before	After

I'm participating in Hacktoberfest, so if PR is ok, I'd like it to be labeled as hacktoberfest-accepted.

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[sarah11918]

Thanks for submitting this @wtchnm! I've applied the Hacktoberfest label 🎃 so you should be good for credit there.

Unfortunately this PR will have to wait until og-Chris is back at the keyboard, so I just wanted to give you a quick response and let you know we've got this, but it might not move very quickly. 😄

[wtchnm]

Hi @sarah11918, no problem. Thanks for adding the label and feedback!

[wtchnm]

Thanks, @delucis. Suggestion accepted!