Hanslick-Online/hsl-data-ct: Pre-Release v0.0.8

Adding 50 additional transcripts of the years 1867 and 1891. Updating information on works (inclusion of hyperlinks to digital copies and spelling out the relation between work parts and works) and persons (the description of occupations has been aligned with encyclopedias and data bases such as ÖML, ÖBL, MGG, Grove, Sophie Drinker Institut, Deutsche Biographie, Wien Geschichte Wiki, and others.) Full Changelog: https://github.com/Hanslick-Online/hsl-data-ct/compare/v0.7.0...v0.8.0