Add csv, bibtex and nixos layers

emacs/.spacemacs

@@ -75,6 +75,9 @@ This function should only modify configuration layer settings."
      yaml
      latex
      pandoc
+     csv
+     bibtex
+     nixos
      )
 
    ;; List of additional packages that will be installed without being
@@ -89,6 +92,7 @@ This function should only modify configuration layer settings."
      all-the-icons
      doom-modeline
      smartparens
+     ivy-bibtex
    )
 
    ;; A list of packages that cannot be updated.
@@ -102,6 +106,7 @@ This function should only modify configuration layer settings."
     company-rtags
     flycheck-rtags
     ivy-rtags
+    helm-bibtex
   )
 
    ;; Defines the behaviour of Spacemacs when installing packages.