Netdata-Move

[RaneyDazed]

Netdata

Created netdata.md in saltbox apps, removed from sandbox completely. Added under "Others" on saltbox page.

Also added the Documentation bit to the bottom of the documentation page.

• [x] App documentation page created
• [x] Reference added in apps/sandbox/index.md
• [x] Reference added in mkdocs.yml

[RaneyDazed]

I did read the thing but didn't remove the line my bad lol