git: Add side-by-side diff

Added a simple alteration of diff viewing to also be feasible side-by-side in
addition to the default (delta) diff viewing mode.
Use aliases `gdd` (and `gdds` for staged) to enable.

git/.config/git/config

@@ -26,6 +26,7 @@
   fetchall      = "!git remote | xargs -I R git fetch R"  # fetch from all connected remotes
   diffword      = "!git diff --word-diff=color --word-diff-regex='[0-9A-Za-z_]+'"  # word-wise diff, good for prose
   diffsyn       = "!git difftool --tool difftastic" # add syntax-driven diff using treesitter
+  diffside      = "!DELTA_FEATURES='+side-by-side' git diff" # add side-by-side diffing
 [commit]
   gpgsign       = true                                                 # sign commits as me
   verbose       = true                                                 # Always show diff when preparing commit message

git/.config/sh/alias.d/git.sh

@@ -38,6 +38,12 @@ alias gdds='git diffword --staged'
 
 alias gi='git ignore'
 
+# word-based diff (with custom word regex)
+alias gdw='git diffword'
+alias gdws='git diffword --staged'
+# side-by-side diff
+alias gdd='git diffside'
+alias gdds='git diffside --staged'
 # syntax-based diff
 if exist difft; then
     alias gdy='git diffsyn'