(refactor) Remove Shopify plugin

[brent-hoover]

Resolves #4308 (partially)
Impact: breaking
Type: refactor

Issue

This plugin is included by default even though the vast majority of people will not be using it

Solution

Move this plugin to the "community" namespace.

Breaking changes

To continue to use this plugin after this change you will need to:

1. Clone this repo into <reaction root>/imports/plugins/custom/
2. No additional changes should be required

Testing

App works w/o plugin

1. rm -rf node_modules
2. meteor npm install
3. Start app
4. Ensure everything works as normal

Community app works

1. reaction reset -y
2. Start app and ensure Shopify connector is not available
3. Follow instructions in the README for installing (slightly different than others)
4. Ensure Shopify plugin works as before

[brent-hoover]

@Akarshit assigning this to you since you recently worked with this plugin so hopefully you can test

[Akarshit]

@zenweasel I am getting Error: Cannot find module '/server/api' when I try to run the plugin with v.1.14 which is because Reaction should be imported in a different(1.14 compatible) way here
So I am not sure if I should approve this and open a issue in that repo.
But the current plugin is not compatible with 1.14.

[brent-hoover]

@Akarshit Updated

[Akarshit]

@zenweasel Can you please look at the conflict.

[brent-hoover]

@Akarshit Conflicts merged

Conflicts resolved

[brent-hoover]

@Akarshit Can you give this a thumbs up if ok ASAP?

[brent-hoover]

@Akarshit Conflicts resolved here again. Removing the shopify-api-node package removes a ton of dependent packages (only a few direct dependencies, but each of those dependencies had a ton of dependencies). I just regenerated the package-lock.json again using meteor npm install.