Add list plugin example

[akmarzhan1]

• created a CodeSandbox example for the list plugin here
• added a new page and the example on the website (under “/docs/demos/plugins/lists”)

Issue #2886

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[akmarzhan1]

I have only added the bullet list and numbered list because there were some issues with the checklist (although I imported all of the necessary components, checklists were showing up as bullet lists) and I wasn't sure whether I needed to add the examples from the list plugin only or also from the checklist plugin.

I think I also accidentally set the last PR (mentions example) to get merged to facebook:inline branch instead of the main, which is why now it is showing the previous commits.

Let me know if I need to fix anything.

[fantactuka]

I have only added the bullet list and numbered list because there were some issues with the checklist (although I imported all of the necessary components, checklists were showing up as bullet lists) and I wasn't sure whether I needed to add the examples from the list plugin only or also from the checklist plugin.

Checklist requires some css to render "checkbox"

[acywatson]

Not sure about the package-lock change - did you add a new package?

[akmarzhan1]

Not sure about the package-lock change - did you add a new package?

Also not sure where the changes came from since I didn't add new packages. Should I revert those differences?

[akmarzhan1]

some css

That makes sense! I totally missed these, will add and update

[akmarzhan1]

@fantactuka added the check list css and now it works:

@acywatson reverted the package-lock changes.

Let me know if I need to fix anything else.