feat: new og images config

[rickyzhangca]

addings docs for https://github.com/mintlify/mint/pull/1768

to preview:

1. switch to this branch
2. run mintlify dev
3. check http://localhost:3000/settings/global#open-graph-image

[mohab-sameh]

Super cool. Btw, it would be super useful if you could switch the default dynamic image generation API for a custom one. It's v cool if you can use the same OG API used on the main website on docs too for product brand consistency. Of course there will be some constraints on what and how parameters can be passed. @fmerian @rickyzhangca

[fmerian]

Good idea, @mohab-sameh! Personally, I think it might add a layer of complexity during the initial setup — Something we absolutely want to keep as simple as possible. Don't you think?

[mohab-sameh]

@fmerian Great point and I love the low-friction setup experience! I think if it's an opt-in feature, it should stay simple but allow customization when needed. This could be a great feature for enterprise/pro users who are taking their branding more seriously + yet another incentive to move to a paid plan.