fix `/usr/local/app/node_modules/.bin/node-sass: not found`

[iknowright]

fix node_modules path for production dockerfile

Types of changes

• [x] Bugfix
• [ ] New feature
• [ ] Refactoring
• [ ] Breaking change (any change that would cause existing functionality to not work as expected)
• [ ] Documentation Update
• [ ] Other (please describe)

Description

Describe what the change is related to #1156 After #1151 , the node_modules are misplaced. Should be in usr/local/app.

Steps to Test This Pull Request

Re-build image using updated Dockerfile

Expected behavior

No longer need a manual fix for node_modules path

Related Issue

1156

More Information

Run and tested in staging vm

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (daa9f1b) 70.59% compared to head (913fef7) 70.59%. Report is 37 commits behind head on master.

Files	Patch %	Lines
src/ccip/views.py	50.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1157 +/- ## ======================================= Coverage 70.59% 70.59% ======================================= Files 85 85 Lines 3394 3394 ======================================= Hits 2396 2396 Misses 998 998 ```

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