Clone demo page with embed pointing to the actual page

[crisner]

Fixes #310 (<=== Add issue number here)

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[crisner]

• Cloned index.html to embed.html
• Removed notice from showing in index.html
• Added notice to appear only on embed.html
• Embed code in embed.html points to //publiclab.github.io/leaflet-environmental-layers/example/index.html

Screenshot of embed page with embed code:

[crisner]

@jywarren, could you take a look at this to see if I got this right?

[jywarren]

Looks perfect!

[jywarren]

Thanks a ton!!!!!

[crisner]

🎉 😃

[sagarpreet-chadha]

Awesome!!!