Revert "Use delta as git diff pager"

This reverts commit b37187f79e.

git/.config/git/config

@@ -4,7 +4,6 @@
 	signingkey = 9893DA236405AF57
 [core]
 	excludesfile = /home/coolneng/.config/git/global_gitignore
-    pager = delta
 [credential]
 	helper = !pass-git-helper $@
 [commit]
@@ -18,12 +17,8 @@
 [filter "git-ignore-line.sh"]
 	clean = /home/coolneng/.dotfiles/scripts/.local/share/scripts/git-ignore-line.sh
 	smudge = cat
-[interactive]
-    diffFilter = delta --color-only
 [add.interactive]
     useBuiltin = false # required for git 2.37.0
-[delta]
-    navigate = true    # use n and N to move between diff sections
 [merge]
     conflictstyle = diff3
 [diff]