dev, rust: Extract Rust config into separate file

Move configuration regarding Rust into its own file.

.emacs.d/config/dev.el

@@ -22,18 +22,6 @@
   :ensure t
   :bind ("M-s d" . deadgrep))
 
-;; rust
-(use-package cargo :ensure t)
-(use-package cargo-mode :ensure t)
-(use-package rust-mode :ensure t)
-(use-package flycheck-rust :ensure t)
-
-;; start cargo
-(add-hook 'rust-mode-hook 'cargo-minor-mode)
-
-;; format code when saving
-(setq rust-format-on-save t)
-
 ;; yaml
 (use-package yaml-mode :ensure t)
 (use-package flycheck-yamllint :ensure t)

.emacs.d/config/rust.el

@@ -0,0 +1,13 @@
+(use-package cargo
+             :ensure t
+             :config
+             ;; enable cargo keybindings
+             (add-hook 'rust-mode-hook 'cargo-minor-mode))
+
+(use-package rust-mode
+             :ensure t
+             :config
+             ;; format code when saving
+             (setq rust-format-on-save t))
+
+(use-package flycheck-rust :ensure t)