CSS best practices: rearrangements

[bertfrees]

Preview

Should fix at least these issues:

• https://github.com/daisy/ebraille/issues/82 (Spacing)
• https://github.com/daisy/ebraille/issues/83 (Spacing)
• https://github.com/daisy/ebraille/issues/162 (Indentation)
• https://github.com/daisy/ebraille/issues/84 (Alignment, positioning and spatial arrangement)

[bertfrees]

If no one objects, I'll merge later today.