Inconsistent timelines

[DanielYang59]

Noticed the default timelines are inconsistent, for example has three different defaults:

[gingerwizard]

few things:

1. Date range for downloads chart is using < and should be <=. Simple fix @lio-p
2. Right now we take the lowest date across all packages i think and use this date, we could use the earliest date for the package - we'd still have inconsistencies though as Github and downloads data has different date ranges and data availability. Maybe we just pad with 0s @lio-p
3. date is being rounded on the stars -not a big issue imo. Its an "estimate"