[w3c/uievents] Regenerate index.html (#296)

https://github.com/w3c/uievents/pull/292 didn't update index.html, and this patch does.


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### :boom: Error: 500 Internal Server Error :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Mar 19, 2021, 2:18 AM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [Spec Generator](https://www.w3.org/2015/labs/) - Spec Generator is the web service used to build specs that rely on ReSpec.

:link: [Related URL](https://labs.w3.org/spec-generator/?type=respec&url=https%3A%2F%2Frawcdn.githack.com%2Fw3c%2Fuievents%2Fd627df3a9733c6a260b20790f6226bde3373a08f%2Findex.html%3FisPreview%3Dtrue)

```
🕵️‍♀️  That doesn't seem to be a ReSpec document. Please check manually: https://rawcdn.githack.com/w3c/uievents/d627df3a9733c6a260b20790f6226bde3373a08f/index.html?isPreview=true&publishDate=2021-03-19

```

_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20w3c/uievents%23296.)._
</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents/pull/296


-- Commit Summary --

  * Remove [[!DOM-Level-2-Events]] to fix bikeshed fatal error
  * Regenerate index.html

-- File Changes --

    M index.html (2022)
    M sections/event-types.txt (18)

-- Patch Links --

https://github.com/w3c/uievents/pull/296.patch

https://github.com/w3c/uievents/pull/296.diff


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