feat(angular): Add Angular CLI + Webpack Plugin sourcemaps upload guide

[Lms24]

This PR adds a new source maps upload guide to our Angular SDK docs: Users can make use of the Angular CLI and the Sentry Webpack plugin to upload source maps. This requires a custom Angular builder. Changes:

• Add a tutorial for Angular CLI + Webpack plugin
• Add Angular-specific source maps overview and source maps uploading index page
• Let the PageGrid component accept an exclude prop to exclude certain entries from being displayed
  • Otherwise we show source maps upload option twice, once in the "recommended" section and once in the "other options" section of the uploading index page.

closes #6326

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Name	Status	Preview	Comments	Updated
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 6, 2023 at 0:48AM (UTC)

[lizokm]

I've made some tweaks and proposed a content restructure. Happy to set up some time to talk about it :)

If this needs to go out quickly, we can push it and then talk about the content restructure as a next step.