fixed #73 removed tracking of node_modules in backend folder

[saikiranrudra]

What is the change?

Since backend/node_modules was committed previously that's why even though it was ignored in .gitignore it was getting tracked

The following thing I have made to fix it

1. I removed it from the cached using

git rm --cached  node_modules 

2. deleting the node_modules committed the changes

What does it fix/add?

node_modules in backend will not be tracked from now but not removed from history need to be deleted and commit to not be shown in future clones

How was it tested?

1. Deleted backend/node_modules and did npm install
2. Did git status to see weather backend/node_modules is tracked or not. it seen that backend/node_modules is not getting tracked

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