Untangle reference and narrative content

[bmorelli25]

Separate reference and narrative content in preparation for migration.

Related to https://github.com/elastic/docs-projects/issues/263.

[colleenmcginnis]

@mdbirnstiehl I know you're handling the solutions section in the IA inventory. Would it be helpful for me to untangle any reference/narrative content for synthetics and APM or would that step on your toes?

[mdbirnstiehl]

@mdbirnstiehl I know you're handling the solutions section in the IA inventory. Would it be helpful for me to untangle any reference/narrative content for synthetics and APM or would that step on your toes?

@colleenmcginnis feel free if the spirit moves you and we can discuss/update the spreadsheet accordingly.