fix(og): decode xml tags in og images

[WarningImHack3r]

Fix OG images containing <s (among others) displaying text with escaped characters (<).

This fix is taken directly (and adapted) from the code I wrote in Svelte Changelog (here then here), as we use the same core logic and I encountered the exact same issue. :D

Before (svelte.dev)	After (localhost)

Notes on the code

• I took advantage of the existing escape.js file to add in my (opposite) logic, which is exactly made for this purpose (lucky me!). In the existing code, I lifted the regex out of the function so it can be computed only once, and made it dynamic so that everything derives from the single existing record. I also added more characters to the record. Finally, I added a null check to the existing function to avoid any problem, even though it'll very likely never be used!
• I duplicated the vnode logic to both the OG image generators, as a bunch of the logic is already duplicated between both, and I don't really know where to put it anyway; it's very dependent on the very computing code in the core of the generators. Let me know if you have any suggestions!

Note

The CI lint step fails because of the same problem existing on master, I can't do much about it :(

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