Adding documentation for the new dtn partition

[monaghaa]

alpine-hardware.md

• added dtn partition to hardware table
• added usage examples for dtn partition in Specialty section.

data-transfer.md

• added information on entering password/accepting duo push for scp and rsync
• made Windows OS comments for scp and rsync into "notes"
• added ticks around commands in Rclone section
• addressed some spelling errors

node-types.md

• updated DTN section and added reference to the dtn partition.

blanca.md

• added section on using dtn partition from Blanca
• removed two outdated FAQs
• fixed a spelling typo

conf.py
Added entries for number of dtn nodes (ucb and total)

[SchneiderCode]

Thanks for the additional updates. It looks great!