feat(shell): add bash-style history expansions and interactive keybindings

- Replicate bash bang-operations (!^, !*, !string, etc.) via abbreviations
- Add Ctrl+G for previous path head insertion
- Add Ctrl+F for interactive history substitution
- Add Ctrl+Alt+U to quickly replace command tokens
- Update README documentation for all new features

functions/expand_bang_all.fish

@@ -0,0 +1,11 @@
+function expand_bang_all
+    set -l token $argv[1]
+    if test -z "$token"; set token (commandline -t); end
+    
+    set -l tokens (string split -n " " -- $history[1])
+    if test (count $tokens) -gt 1
+        echo -- (string join " " -- $tokens[2..-1])
+    else
+        echo -- $token
+    end
+end