wip: dir organisation, script cleanup

scripts/install/02-fish.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+if not_installed "fish"; then
+    add_ppa "fish-shell/release-3"
+    update
+    install fish
+fi
+fish --version
+
+fisher_location="$HOME/.config/fish/functions/fisher.fish"
+if ! [ -f "$fisher_location" ]; then
+    curl https://git.io/fisher --create-dirs -sLo "$fisher_location"
+    fish -c "fisher install jorgebucaran/fisher"
+fi
+
+fish -c "fisher --version"