refactor: Remove unrequired wsgi.file

[PrashanthPuneriya]

Is your pull request related to a problem? Please describe

After refactoring the project we no longer need wsgi.py file. This makes Flask to execute wsgi.py file first instead of executing the create_app() view in the fbosbot file by default. This causes project setup error as described in #20. So, removing this file would fix #20 and #30.

Describe the solution you'd like

Remove the wsgi.py file.

Describe alternatives you've considered

• Updating and fixing the wsgi.py file code. But, it would cause code redundancy.

• 21 PR.

Checklist

• [x] My code follows the code style of this project.
• [x] I have read the CONTRIBUTING document.
• [x] All new and existing tests passed.
• [x] The title of my pull request is a short description of the requested changes.