Document already existing components

[fengelniederhammer]

This is a follow-up to #129. In the same style, document the existing components:

• [x] #194
• [x] #195
• [x] #196
• [x] #197
• [x] #198
• [x] #199
• [x] #200
• [x] #201
• [x] #202
• [x] #220
• [x] #221