ci: add test workflow and fix code quality issues

- Add CI test job with Emacs batch load and byte-compile
- Fix settings-file variable check in init.el
- Fix extra parenthesis in init-neotree.el
- Add missing projectile dependencies in neotree and web-mode
- Fix add-hook usage in init-icons.el
- Add hydra dependency in init-ivy.el
- Standardize header style in init-company.el

modules/init-icons.el

@@ -15,7 +15,7 @@
   ;;---------------------------------
   (when (display-graphic-p)
     (unless (member "all-the-icons" (font-family-list))
-      (setq neotree-mode-hook 'all-the-icons-install-fonts))))
+      (add-hook 'neotree-mode-hook #'all-the-icons-install-fonts))))
 
 ;; fix performace
 (setq inhibit-compacting-font-caches t)