Updates to docs, examples and tests.

[jamesrweb]

Fixes #164.

Proposed Changes

• Update README to show expected usage of the P5CanvasInstance over the P5Instance type since this will be deprecated in the next major version.
• Update the code for the example to be more efficient and clean.
• Add a class to the wrapper for users who wish to target the wrapper or child elements with css. This was of course possible but the change here will make it "easier".

Additional Notes (optional)

Fixes, if you can call it that, #164. I say "if you can call it that" since as I mentioned before, using css or js was previously possible for such use cases and this just makes it a little simpler with a class to specifically target other than P5s own one on the canvas proper.

[jamesrweb]

@yevdyko please ensure you test the documentation examples and the example app itself as part of the review. Thanks in advance 🚀!

[yevdyko]

@yevdyko please ensure you test the documentation examples and the example app itself as part of the review. Thanks in advance 🚀!

@jamesrweb the changes look correct in the diff, tomorrow I will check the code in the examples so that it works as expected. Thanks for the improvement and hopefully it will be easier to use the component in the future 💪

[yevdyko]

@jamesrweb I've tested the typescript examples from the README as well as the demo application. Everything works as expected, as far as I can see.

🚢 🚢