refactor: varnames
refactor: reuse TitleFinder to find title for spotify
fix:: set outputEncoding utf-8 to remove error message
refactor: extract methods
refactor: create Finder interface
refactor: use correct structure for util class
refactor: move envvars into util package
feat: add html files to test against
feat: add commons io to deps
docs: add spotify info
refactor: rename class