fix(navigation): Improve helm-ag keybindings

Have both `C-c C-'` and `C-c '` bound to `helm-do-ag-project-root`, so
it can be triggered from a terminal. As `C-'` cannot be sent to emacs
due to limitations of terminal emulators.

Also move `helm-do-ag` from `C-c C-s` to `<helm-prefix> a`, now that the
`helm-command-map` can reliably be used. This effectively means you
trigger `helm-do-ag` with `C-c h a` right now.

modules/navigation/siren-helm-ag.el

@@ -12,10 +12,12 @@
   :straight (:type git :host github :repo "emacsorphanage/helm-ag"
                   :fork (:host github :repo "jimeh/helm-ag"
                                :branch "personal-patches"))
-
+  :after (helm-config)
   :bind
-  ("C-c C-s" . helm-do-ag)
+  ("C-x '" . helm-do-ag-project-root)
   ("C-x C-'" . helm-do-ag-project-root)
+  (:map helm-command-map
+        ("a" . helm-do-ag))
 
   :custom
   (helm-ag-base-command "rg --no-heading")