Templating documentation and guides to use a specific chain

The basic of the idea is this:

• We'd have a dropdown somewhere in the site where you could "Select a blockchain"
• This dropdown would contain Jungle4, EOS, WAX, Telos, and UX
• When the user changed this dropdown, it'd remember their choice and show somewhere on the page
• As the user is browsing documentation or guides, all the chain-specific information would change to be that blockchain
• This means https://jungle4.greymass.com would be not always jungle 4, but a specific chain
• The same as the above, except with chain IDs.

This idea came from Telegram here: https://t.me/wharfkit/1362

I'm not sure how we'd accomplish this, except maybe we write some kind of variable into the page that happens on page render? Maybe there's a [[[chain_url]]] string in the markdown, which then persists in the HTML, and when the page renders, reads the users preference and renders https://jungle4.greymass.com?

I'm not sure we should jump on this immediately, but would like to know what kind of effort it'd take to pull this off.