Refactored docs structure and added new API doc source files with a new

docs/source/api/ingestion.IDIFITSUtil.rst

docs/source/api/ingestion.IngestionManifest.rst

docs/source/api/ingestion.JSONMetadataUtil.rst

docs/source/api/ingestion.NGASUtil.rst

docs/source/api/ingestion.UVFITSUtil.rst

docs/source/api/ingestion.VLBAFITSUtil.rst

docs/source/api/ingestion.almautils.rst

docs/source/api/ingestion.archive.rst

docs/source/api/ingestion.archive_caltables.rst

docs/source/api/ingestion.archiveutils.rst

docs/source/api/ingestion.commands.rst

docs/source/api/ingestion.evlasciencedatamodel.rst

docs/source/api/ingestion.files.ingestobs.rst

docs/source/api/ingestion.files.ngasclient.rst

docs/source/api/ingestion.files.rst

docs/source/api/ingestion.manifestpersist.rst

docs/source/api/ingestion.metadata.rst

docs/source/api/ingestion.metadata.sciencemodel.rst

docs/source/api/ingestion.persistVLBAmetadata.rst

docs/source/api/ingestion.persistcaltables.rst