fix(catalog): center items in blockquotes

[vdegenne]

Elements are not properly centered in blockquotes I noticed:

[vdegenne]

I bumped the first element with a 4px top margin which makes the content look centered when there is alone one line, and it doesn't create a visual discomfort in the case of paragraphs.

@e111077 is it good?

[e111077]

heya thanks for the tag. Unfortunately the automation to launch the catalog doesn't work on forks. I wonder if i could fix that without exposing our CI and Firebase resources to different projects not contributing to this project.

[vdegenne]

@e111077 You found a way I see.

[e111077]

I opened it in codespaces and ran it there. Much easier than cloning and getting a local version going

[vdegenne]

Haha!
Should I do something specific next time I find another change I can make?

[e111077]

No it's something we need to figure out here:

https://github.com/material-components/material-web/blob/main/.github/workflows/firebase-hosting-pull-request.yml#L10C57-L10C123

We check if it's our repo because we don't want someone to fork and be able to deploy to our firebase instance / use our resources for their personal needs.

Maybe this is not necessary since I don't think forks have our secrets. Or maybe we should change that check to see if it has a pull request target of our repo.