Weekly contribution mode

[DenverCoder1]

Is your feature request related to a problem? Please describe.

Contributing to GitHub every day is a huge commitment.

Some users may want the option to take off on the weekends or at other busy times during their week due to other life commitments.

Having only the option to show a daily streak makes it so that people who can't contribute every day won't have a streak to show off.

Describe the solution you'd like

Add a "Week Streak" mode, toggle-able from the url options that will display the number of consecutive weeks instead of days.

This will allow more users to have a streak they are proud to display.