docs: add debounce example

[bashbunni]

Changes:

• add debounce example and context provided from Slack (https://charm.sh/slack, btw)

[maaslalani]

Let me know if there is a specific reason this is better as markdown though that I haven't considered but I think this should be a examples/debounce/main.go so that you can run / modify the example and so that if we ever need to update it we can ensure it still compiles. The "How it works" section is awesome and we can put that at the top of the go file as a comment.

[bashbunni]

I agree! Can move it to a running example

[bashbunni]

(moved to an example instead of docs)

[bashbunni]

let me know if comments could be improved or anything!

[maaslalani]

Should the view maybe show the tag so that if someone runs this example they see something changing?

[bashbunni]

Great idea!

[bashbunni]

heh, forgot to rebase from master before pushing 😂

[meowgorithm]

Thank you @bashbunni!