Arrange plugins by type

[igorlukanin]

Awesome Contribution Checklist:

• I have read, and re-read the Contributing Guidelines
• I have searched to ensure the suggested item doesn't exist on this list
• This PR contains only one item

Please Describe Your Addition

Following the conversation in this PR (chartjs/Chart.js#10764), I've rearranged the list of plugins by type so it's easier to navigate through it and look for relevant plugins.

@LeeLenaleee @kurkle @etimberg @simonbrunel I'd like to know what you folks think.

Also, I think we can probably remove some of barely used items from this list. Take chartjs-plugin-waterfall that has only 353 weekly downloads on npm.

[kurkle]

I think @simonbrunel was against putting the plugins in categories, but to me this looks fine.

[igorlukanin]

Given the current size of the list of plugins, I honestly think that categories make it easier to navigate. However, I'm very much open to @simonbrunel take on this.

[simonbrunel]

I think @simonbrunel was against putting the plugins in categories, but to me this looks fine.

I can't remember if that was actually the case (maybe there was not enough entries to justify categories).

@igorlukanin I like it organised in categories as you did (a few minor remarks).

[kurkle]

I can't remember if that was actually the case (maybe there was not enough entries to justify categories).

Could have been a single new category too, or I just remember wrong 🧐

[igorlukanin]

@kurkle @simonbrunel Should be good to go now!

[simonbrunel]

Thanks @igorlukanin