Use Node.js to run script

[cafca]

• [x] Create NPM package (package.json)
• [x] Add .gitignore
• [x] Adapt dumpjson.html code into main.js and converter.js, make converter a module with exports
• [x] Write output to file system instead of document
• [x] Run original Wahl-o-Mat JS statements in sandbox
• [x] Create boilerplate to parametrize main script for different output formats:
• [x] Export of occasions
• [x] Export of occasiondata
• [x] Export of parties
• [ ] Export of theses_categories
• [ ] Export of categories ~- [ ] Adapt alltheses.html~~ ~- [ ] Adapt alltheses_categories.html~ ~- [ ] Adapt alltheses_direct.html~ ~- [ ] Adapt dumpcsv.html~ ~- [ ] Adapt metadata.html~
• [x] Add docstrings
• [x] Add instructions for setup and execution of script

To run:

1. Install node.js, npm
2. Run npm install in root
3. Run node src/main.js