Remove unused functions for old prompts

dot-config/zsh/functions/prompt_pure_set_title

@@ -1,27 +0,0 @@
-#! zsh
-# copied from https://github.com/sindresorhus/pure/blob/43aafe0b4dc05174c57ee623c03c64400e832ece/pure.zsh#L56
-setopt localoptions noshwordsplit
-
-# Emacs terminal does not support settings the title.
-(( ${+EMACS} || ${+INSIDE_EMACS} )) && return
-
-case $TTY in
-	# Don't set title over serial console.
-	/dev/ttyS[0-9]*) return;;
-esac
-
-# Show hostname if connected via SSH.
-local hostname=
-if [[ -n $prompt_pure_state[username] ]]; then
-	# Expand in-place in case ignore-escape is used.
-	hostname="${(%):-(%m) }"
-fi
-
-local -a opts
-case $1 in
-	expand-prompt) opts=(-P);;
-	ignore-escape) opts=(-r);;
-esac
-
-# Set title atomically in one print statement so that it works when XTRACE is enabled.
-print -n $opts $'\e]0;'${hostname}${2}$'\a'

dot-config/zsh/functions/starship_pure_title_precmd

@@ -1,3 +0,0 @@
-#! zsh
-autoload prompt_pure_set_title
-prompt_pure_set_title 'expand-prompt' '%~'

dot-config/zsh/functions/starship_pure_title_preexec

@@ -1,3 +0,0 @@
-#! zsh
-autoload prompt_pure_set_title
-prompt_pure_set_title 'ignore-escape' "$PWD:t: $2"