Add Twitter Meta Tags

[solonovamax]

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Is your feature request related to a problem? Please describe.
Currently, Nextcloud does not use any twitter meta tags.
This causes embeds/link previews on sites that use those tags to not look as nice, specifically when sharing a link to an image.

For example, on twitter:

or on discord:

In this (preview for a) post, the url https://nextcloud.solonovamax.gay/s/4k7ykyBZWtsozBy is linked. I would expect that it renders a large thumbnail showing the full image, rather than just a small thumbnail.

Describe the solution you'd like
Adding the twitter:card meta tag with the value of summary_large_image when linking to an image.

Here's how I would expect it to look on discord (This was created using a "discord embed editor", plus a couple of changes to the css/html to have to look similar, which is why certain elements may not look identical):

Describe alternatives you've considered
Not adding the twitter:card meta tag.

Additional context
N/A

[solonovamax]

I'm going to PR a change that solves this in a few.