[ENH] Add a troubleshooting section

[marcobarilari]

Is there an existing issue for this?

• I have searched the existing issues

New feature

Add a troubleshooting section with actual errors and solution that I (plus what I heard from others) have encountered.

Unclear documentation

No response

[marcobarilari]

add how to increase download/upload speed by adding to ~.ssh/config this

Host gin.g-node.org
    Compression yes
    Ciphers aes128-ctr