Add optional link to protondb page on store

[rmburg]

Since this is basically a must-check before buying a game on Linux, it would be nice to have a link on the game's store page.
For example: on the store page there should be a button leading to the game's protondb page

[xPaw]

No plans for this, sorry. Perhaps ProtonDB can make a userscript themselves to add this.

[jn64]

Alternative solution: a simple bookmarklet that swaps store.steampowered.com with www.protondb.com.

javascript:(function(){var l=location;var h=l.hostname,p=l.pathname,S='store.steampowered.com',P='www.protondb.com';if(h==S){l.assign('https://'+P+p)}else if(h==P){l.assign('https://'+S+p)}})();

Click this bookmarklet on https://store.steampowered.com/app/123/xyz to load https://www.protondb.com/app/123/xyz, or vice versa.

I don't even check if the path starts with /app, but obviously it only makes sense to use on such pages. Both sites technically ignore the first path segment after the appid (/xyz).

Related #164 #246

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I use this same type of bookmarklet to swap between www.reddit.com and old.reddit.com, amazon.com and another country, Dotabuff and OpenDota match history, anything else where two sites point to the same identifier with a similar path.