Add SSH config snippets to FAQ for exe.dev host key and VM access

Discord Message

Author: realami Channel: #feedback Link: https://discord.com/channels/1405685085923049482/1405686161791516873/1454602539738730760

FAQ suggestions:

1. the answer to the first question could usefully suggest a snippet for ~/.ssh/config to avoid fingerprint/authenticity questions when ssh'ing into exe.dev's spawned VMs:

Host *.exe.xyz
    HostKeyAlias exe.dev

2. the answer to the second question could s/Host exe.dev/Host exe.dev,*.exe.xyz/ to use the exe.dev-specific identity file for generated VMs as well.