docs: reorganize installation instructions into individual pages for each module

[wesleygrimes]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Missing documentation on use of ng add

What is the new behavior?

Added a new section to the https://ngrx.io/guide/store that documents how to use the ng add commands for NgRx.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Cross-reference #1146

[ngrxbot]

Preview docs changes for b487127 at https://previews.ngrx.io/pr1523-b487127/

[wesleygrimes]

Just realized I missed some of the other ng add options. As I think about this more, how about I split this up and add a section to the each of the main doc sections for ng add. So under the getting started area for Store I will document ng add @ngrx/store under the getting started area for Store DevTools I will document the ng add @ngrx/store-devtools and etc...

[brandonroberts]

What do you think about having a dedicated "Installation" page for each library? It would have the normal npm/yarn instructions, and have the instructions on using ng-add and what it does. I want to keep the overview pages pretty light.

[timdeschryver]

@wesleygrimes I was just typing the same thing but in another way.
What about adding a general Installation page with all of ng add commands.

[wesleygrimes]

@brandonroberts @timdeschryver I'm good with either way... I personally like the idea of an Installation link under each main section like Store > Installation, Store Devtools > Installation. And then I will move what is in Getting started there for each and add the ng add commands there as well.

[wesleygrimes]

@brandonroberts @timdeschryver ok, I almost have it, one question, do you want the getting started pages to still have a link to the installation pages or do you just want them to find it by clicking the navigation links?

[brandonroberts]

I think a link to the page is good.

[wesleygrimes]

@brandonroberts @timdeschryver ok updates have been posted, also renamed the PR to reflect more of what is included.

[ngrxbot]

Preview docs changes for 9b3d048 at https://previews.ngrx.io/pr1523-9b3d048/

[timdeschryver]

LGTM 👍 !
Would you also want to include the rest of the ng add commands?

[wesleygrimes]

@timdeschryver @brandonroberts I have pushed a final commit that includes the ng add documentation for each module. It also now includes all the optional flags that you can pass for each module. Let me know if you need anything else. Thanks ya'll!

[ngrxbot]

Preview docs changes for 67c1238 at https://previews.ngrx.io/pr1523-67c1238/

[brandonroberts]

Minor fixes with extra semicolons and typo

[brandonroberts]

Prefix commits with docs: also.

Looks great!

[wesleygrimes]

Thanks! I’ll get these resolved in the morning! Have a great evening.

[ngrxbot]

Preview docs changes for 6bd14b8 at https://previews.ngrx.io/pr1523-6bd14b8/