Reindent configuration file example, improve readability, etc.

[sh-cho]

• Reindent fluent-bit (classic) configuration file example with 4 spaces
  • Entries under section must be indented, 4 spaces ideally (docs)
  • You don't necessarily need to make it 4 spaces (any same indent level in single section is OK -just like python), but many people copy the example code from the documentation and try to use it, so IMO it's better to make it ideal.
• Add empty line between sections in config file
• Add syntax highlight for yaml ( ```yml)
• Remove 'Line separator(U+2028)' character from vivo-exporter

[lockewritesdocs]

LGTM 🦖 Thanks @sh-cho!