feat(tricks): auto-create fish-config.1 symlink on shell start

The symlink from ~/.local/share/man/man1/fish-config.1 to
docs/fish-config.1 is now created automatically alongside the
existing MANPATH setup, making `man fish-config` work out of the
box on any machine after cloning. Simplified docs accordingly.

conf.d/tricks.fish

@@ -17,10 +17,16 @@ end
 fish_add_path ~/.local/bin
 fish_add_path ~/Applications/depot_tools
 
-# Expose user-local man pages (e.g. fish-config.1 symlinked from docs/)
+# Expose user-local man pages and keep fish-config.1 symlink current
 if not contains ~/.local/share/man $MANPATH
     set -gx MANPATH ~/.local/share/man $MANPATH
 end
+set -l _man1 ~/.local/share/man/man1
+set -l _src ~/.config/fish/docs/fish-config.1
+if test -f $_src; and not test -L $_man1/fish-config.1
+    mkdir -p $_man1
+    ln -sf $_src $_man1/fish-config.1
+end
 
 # Format man pages using bat (only if bat is installed)
 if type -q bat