[Bug] - Spell check

[barrymun]

What bug did you find in the codebase?

There are some spelling errors in CategoryList.tsx and CopytoClipboard.tsx for example.

Adding a spell checker (proposing cspell: https://cspell.org/) to help avoid these kinds of issues in the future.

Of course, some spelling errors are deliberate (like in some of the code snippets), so an ignore list would also have to be created.

[barrymun]

Currently working on this myself but will wait for #73 to be completed before creating a new PR.