release separate widget and calendar for nepdate

What's Changed

• project rearrange and add features by @khumnath in #1
• implemented tithi.
• improved ui and made saturdays red and today green.
• dates can be now edited by user so there is not limit for 200 years.( still need inspection for past events for correct date and tithi calculation. working 200 years past and future as i tested.)

New Contributors

• @khumnath made their first contribution in #1

Full Changelog: v1.0...v1.01