Use eza instead of exa

According to [this][issue], `exa` is now unmaintained. It recommends
to use the actively maintained [`eza`][eza] fork instead.

[issue]: ogham/exa#1243
[eza]: https://github.com/eza-community/eza

init/30_osx_homebrew_recipes.sh

@@ -20,6 +20,7 @@ recipes=(
   diff-so-fancy
   dos2unix
   elm
+  eza
   fd
   findutils
   fswatch

init/50_rust.sh

@@ -7,7 +7,6 @@ fi
 crates=(
     bat
     fd-find
-    exa
     hx
     lsd
     ripgrep

source/50_navigation.sh

@@ -2,11 +2,11 @@
 
 export LS_COLORS='no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.bz2=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.avi=01;35:*.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.ogg=01;35:*.mp3=01;35:*.wav=01;35:'
 # Always use color output for `ls`
-if is_available exa; then
-    alias ls='exa -I "*~"'
-    alias la='exa -a'
+if is_available eza; then
+    alias ls='eza -I "*~"'
+    alias la='eza -a'
     # h is actually for "header" here
-    alias ll='exa -alh --git --icons'
+    alias ll='eza -alh --git --icons'
 elif is_available lsd; then
     alias ls='lsd -I "*~"'
     alias la='lsd -A'