replace ykrun with runbg for background command execution

... to solve the nvm-sh environment issue.(mostly vscode)

NOTE: may also import other envvars, tbc.

.zshrc

@@ -149,14 +149,6 @@ export GPG_TTY=$TTY
 
 alias noproxy='env -u http_proxy -u https_proxy'
 
-alias ykls='systemctl --user status YukiLauncher.slice'
-alias yksuspend='systemctl --user freeze YukiLauncher.slice'
-alias ykcout='systemctl --user thaw YukiLauncher.slice'
-alias ykexit='systemctl --user stop YukiLauncher.slice'
-
-alias susp="systemctl --user freeze"
-alias cont="systemctl --user thaw"
-
 export NVM_DIR="$HOME/.nvm"
 [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
 [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion