Updating index page

[shravan91]

Updating index page

1. Create a better and clear font type for the index page
2. Remove the existing red theme and make it lighter @jimishio
3. Make the picture of "Kankaria Lake" black and white or lighter in shade @jimishio @ndkcha
4. Linking the Upload page to the main page | Adding a link on the main page @gnatih
5. Changing the contact details Having an Email ID for contributing and contact #4 @jimishio @shravan91