feat: remove zpextract and use ziextract (#611)

Signed-off-by: Vladislav Doster <mvdoster@gmail.com>

doc/zsdoc/zinit-install.zsh.adoc

@@ -30,7 +30,6 @@ Documentation automatically generated with `zshelldoc'
  zicp
  ziextract
  zimv
- zpextract
  ∞zinit-atclone-hook
  ∞zinit-atpull-e-hook
  ∞zinit-atpull-hook
@@ -588,7 +587,6 @@ Called by:
  .zinit-extract
  .zinit-get-package
  .zinit-setup-plugin-dir
- zpextract
 
 ==== zimv
 
@@ -599,16 +597,6 @@ Has 3 line(s). Calls functions:
 
 Not called by script or any function (may be e.g. a hook, a Zle widget, etc.).
 
-==== zpextract
-
-Has 1 line(s). Calls functions:
-
- zpextract
- `-- ziextract
-     `-- zinit.zsh/+zi-log
-
-Not called by script or any function (may be e.g. a hook, a Zle widget, etc.).
-
 ==== ∞zinit-atclone-hook
 
 Has 26 line(s). Calls functions:

zinit-install.zsh

@@ -1923,10 +1923,6 @@ ziextract() {
         }
     )
 } # ]]]
-# FUNCTION: zpextract [[[
-zpextract() {
-  ziextract "$@"
-} # ]]]
 # FUNCTION: .zinit-at-eval [[[
 .zinit-at-eval() {
     local atpull="$1" atclone="$2"