About discussions edits

[Sharra-writes]

Why:

Trying to improve the scannability of About discussions.

What's being changed (if available, include any code snippets, screenshots, or gifs):

If the goal of an "about" is to present the reader with reasons to use a product, it doesn't make sense to fill the article with all the intricate details of how the product works. I cut a lot of that, trying to give more of an overview. I also got rid of some reusables that weren't being reused (or in one case used) anywhere.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
discussions/collaborating-with-your-community-using-discussions/about-discussions.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13
discussions/collaborating-with-your-community-using-discussions/collaborating-with-maintainers-using-discussions.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13
discussions/managing-discussions-for-your-community/managing-categories-for-discussions.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13
discussions/managing-discussions-for-your-community/managing-discussions.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[lecoursen]

Overall, this PR does a really great job of reorienting the article around "why" instead of "how." Since you asked for a 30% review, I mostly only left some ideas to consider, with a few line-level suggestions purely to function as examples. Let me know if you have any questions! ✨

[sabrowning1]

This looks great! ✨ 🚀

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