Code button <> on examples pages leads to 404

[jameskane05]

Go to any example:

https://sparkjs.dev/examples/
https://sparkjs.dev/examples/#envmap

Click the <> button in the bottom right. This should open up the example in code, but it leads to a 404 currently.

For ex, the link for the env map example leads to this, which is a 404:

https://github.com/sparkjsdev/spark/blob/main./envmap/index.html

The actual URL should be:

https://github.com/sparkjsdev/spark/blob/main/examples/envmap/index.html