Some Basic Improvements

[rezkam]

• Update gitignore file ( Using standard python gitignore file from github: https://github.com/github/gitignore/blob/master/Python.gitignore)
• Getting Application Secret Key and other secrets ( RECAPTCHA_SECRET_KEY and POSTMARK_API_TOKEN ) from Environment variables.
• Create a utils file for Web application and move reusable codes and utils to this file
• Using Django crypto get_random_string in register view to generate random strings ( far better and faster than using string and random. Also this not predictable by an attacker) You can change allowed_chars for the random string seed.
• Optimize imports in views
• Using relative imports inside applications ( Using relative imports for inside app imports based on Django coding style: https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/coding-style/#imports ) 🐼🐼🐼

[rezkam]

@jadijadi Sorry this merge request has some conflicts on views file. I can't fix them because I don't know the logic behind this application. Please review and fix them before merging this merge request.