Use firebase keys from enviroment configuration instead of hard coding.

[bvpmosc-bot]

Currently, different keys like firebase API keys are hard coded into the codebase. Instead of this, we should set these keys as environment variables and npm should pick them up from environment on building or serving the applcation.

A reference can be taken from http://github.com/bvpmosc/mosc-curated

[harshyadav9]

can i take up this one