Updated repository URL to address broken npm images

[shilman]

Issue: #1196

What I did

Updated repository URL to address broken npm images.

How to test

1. I'm not sure how to test this other than just merging and releasing
2. I'm not sure whether any other tools depend on the old repository structure
3. The new structure looks valid per NPM docs: https://docs.npmjs.com/files/package.json#repository
4. The old structure does not look valid?

[codecov]

Codecov Report

Merging #1197 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1197   +/-   ##
=======================================
  Coverage   13.31%   13.31%           
=======================================
  Files         199      199           
  Lines        4589     4589           
  Branches      620      613    -7     
=======================================
  Hits          611      611           
- Misses       3444     3446    +2     
+ Partials      534      532    -2

Impacted Files	Coverage Δ
app/react/src/client/preview/init.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/config_api.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	49.42% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
app/react/src/server/iframe.html.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.41% <0%> (ø)	⬆️
addons/knobs/src/components/types/Select.js	7.14% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_keyevents.js	33.33% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	30.13% <0%> (ø)	⬆️
... and 21 more

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[xavxyz]

👍

I believe the old syntax git+ was to have an alternative install between git and https.