docs: list of deprecated APIs

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[ ] Feature request
[x] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ ] Other... Please describe:

Current behavior

There are many APIs that are deprecated long ago but not removed yet. For example, @angular/http and DeprecatedI18NPipesModule is deprecated as of v5. Or ViewEncapsulation.Native is deprecated as of v6.1. But there isn’t a way to know things which is deprecated other than going to the page.

Expected behavior

I’d like to have a page which shows deprecated APIs so that developers can avoid using them.

Minimal reproduction of the problem with instructions

N/A

What is the motivation / use case for changing the behavior?

Environment

Angular version: X.Y.Z


Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

My mental image of what could this look like:

[jenniferfell]

I started a Google doc over the summer, with the intent to move to .md and submit to aio doc set. Will resume now that v7 work is complete. Thanks for letting know this will be useful.

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