Remove image filename dependency & fix dropdown bug (v1.3.0)

What's Changed

• Remove dependence on Image_filename for image selector by @egrace479 in #62
• Standardize function descriptions by @egrace479 in #64
• Fix bug in dropdown for image selector (Issue #63) by @egrace479 in #65
• dev branch changes (listed above) applied to main and workflow actions updated by @egrace479 in #66
• Update CITATION.cff by @egrace479 in #67
• Fix docker login-action call by @egrace479 in #68

Full Changelog: v1.2.0...v1.3.0