Fix DYM and add aliases

Fixed the use-package! declaration for eshell-did-you-mean since it
needed a different mode in the :after than I thought.
I also put together a quick hack to try and fix an issue with
did-you-mean, but it doesn't seem to work reliably right now. More
testing required.

Also added two aliases, one `gg` for to open magit-status and one `ff`
as an additional alias to find-file that follows the Doom keybindings
better.

modules/term/eshell/README.org

@@ -8,6 +8,7 @@
   - [[#maintainers][Maintainers]]
   - [[#module-flags][Module Flags]]
   - [[#plugins][Plugins]]
+  - [[#hacks][Hacks]]
 - [[#prerequisites][Prerequisites]]
 - [[#features][Features]]
 - [[#configuration][Configuration]]
@@ -37,6 +38,12 @@ company= is enabled.
   + [[https://gitlab.com/ambrevar/emacs-fish-completion][fish-completion]]
   + [[https://github.com/szermatt/emacs-bash-completion][bash-completion]]
 
+** Hacks
++ Even with =fish-completion-fallback-on-bash-p= non-nil, fish must be installed
+  for bash completion to work. Workaround in =config.el=.
++ =eshell-did-you-mean= does not work on first invocation, so we manually invoke
+  it once.
+
 * Prerequisites
 [[https://fishshell.com/][=fish= shell]] for completions, falling back to [[https://www.gnu.org/software/bash/][=bash= shell]] if =fish= is not
 found. If neither shell is found, completions may not be available.