[wiki] Migrate wiki to main repo for long-term archival

wiki/completions.md

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+## Shell Completions Troubleshooting
+ZSH completions not working? Make sure your ~/.zshrc contains the following:
+```
+autoload -Uz compinit && compinit
+```
+...and then restart your shell.
+***
+Bash completions not working? Install your distribution's 'bash-completion' package or source the completion script manually.
+
+For most environments, this would mean adding the following to your ~/.bashrc:
+```
+source /usr/share/bash-completion/completions/sshyp
+```
+Note that this directory is different on FreeBSD and Haiku.
+
+FreeBSD:
+```
+source /usr/local/share/bash-completion/completions/sshyp
+```
+Haiku:
+```
+source /system/data/bash-completion/completions/sshyp
+```
+...and then restart your shell.
+
+*Please note that Bash completions are slightly more limited than ZSH completions, and as such, new entries will not be auto-completed until the completions script is re-sourced.*