Release 2.0.0-alpha.0

• add docu (bc39f9a)
• work on 2.8 compatibility (e031e3d)
• disable legend by default for backwards compatibility (4e99424)
• size scale (a9e9719)
• refactor and start with size legend (0177619)
• cleanup (b0e4ad6)
• fix linting (58c4bc5)
• tuning positions (664102e)
• first running version (8890042)
• wip (81b7d1d)
• work on scales (445cf05)
• work on scale (a249360)
• better tooltips and more color options (e75d94f)
• work on integrating a color scale (67b5ece)
• less specific feature (fdd4c2e)
• avoid some features (aacce52)
• update dependencies (06f77d5)