Image alignment optional; support multiple headers; added PSF plots

Features

• Added PSF plots
• Updated readme text/links on Github
• Support FITS with multiple headers
• Added open elevation API to get elevation based on lat/long
• Updated plate solution
• Image alignment is now optional (e.g., for large datasets)
• Check user’s date format to avoid any UNIX-related path issues

Bugfixes

• Transit code bug fix
• Update FOV legend and labels