Handle firebase invalid api key error

[himanshuvarandani]

Describe the bug
Firebase throws invalid api key error when no environment variables are set in '.env' file.

To Reproduce
Steps to reproduce the behavior:

1. Go to '.env' file
2. Remove all environment variables
3. Try to run application
4. See error

Expected behavior
Application should handle this error and show all the static pages and show error notification or message at each page where api keys are used.

Screenshots