fish: functions: Add aliases for ls/exa and mkdir

fish/.config/fish/functions/l.fish

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+function l -w exa
+  exa -lh $argv
+end

fish/.config/fish/functions/ll.fish

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+function ll -w exa
+  exa -lah $argv
+end

fish/.config/fish/functions/mkdcd.fish

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+function mkdcd -d "Create a new directory and immediately cd into it"
+  mkdir -p -- $argv
+  if test $status = 0
+    cd $argv
+  end
+end

fish/.config/fish/functions/mkdir.fish

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+function mkdir
+  command mkdir -p $argv
+end