Hifitime documentation to follow diataxis

[ChristopherRabotin]

https://www.diataxis.fr/

Inspiration from https://rhodesmill.org/skyfield/toc.html

Tutorials:

• Calculate elapsed times and duration between epochs ? Consider epochs in different time systems, and the ambiguity that lies there. Add the rounding to different units as floats. Goal: understand that time may not be linear and depends on reference epochs and leap seconds (Jupyter notebook)
• Manage leap seconds and custom leap seconds ? Goal: explain leap seconds, introduce UT1 time scale, understand that some scales do not account for leap seconds.

How to guide:

• How to convert from a UTC time into another time zone ?
• How to convert from a UTC time into GPS week and days ?
• How to convert from a UTC time into SPICE / Ephemeris time ?
• How to iterate between two epochs ? Consider different initializations of Epochs.

Reference:

• Move the design into here.

Explanation:

• Details of time scales
• Add the time dialation work by Philip