Fix C-a behavior (#991)

core/prelude-mode.el

@@ -43,6 +43,7 @@
     (define-key map (kbd "C-c y") 'prelude-youtube)
     (define-key map (kbd "C-c U") 'prelude-duckduckgo)
     ;; mimic popular IDEs binding, note that it doesn't work in a terminal session
+    (define-key map (kbd "C-a") 'crux-move-beginning-of-line)
     (define-key map [(shift return)] 'crux-smart-open-line)
     (define-key map (kbd "M-o") 'crux-smart-open-line)
     (define-key map [(control shift return)] 'crux-smart-open-line-above)