Improve pandoc pdf macro for CJK by using M+ font

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/29519461834c08395b35f840811faf8c23e3b61c' (2023-06-02)
  → 'github:nix-community/home-manager/f889ec0ec366e3ad8fb94e3afa7a31f3ee1da3b9' (2023-06-08)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/e635192892f5abbc2289eaac3a73cdb249abaefd' (2023-06-01)
  → 'github:nixos/nixpkgs/381e92a35e2d196fdd6077680dca0cd0197e75cb' (2023-06-07)

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1685721552,
-        "narHash": "sha256-ifvq/zlO7lck8q+YkC5uom/h8/MVdMcQEldOL3cDQW0=",
+        "lastModified": 1686241374,
+        "narHash": "sha256-fxlUjZx3VtQvNPTp/YX9uY//1UPbR3CBvUL3ajDRCyE=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "29519461834c08395b35f840811faf8c23e3b61c",
+        "rev": "f889ec0ec366e3ad8fb94e3afa7a31f3ee1da3b9",
         "type": "github"
       },
       "original": {
@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1685655444,
-        "narHash": "sha256-6EujQNAeaUkWvpEZZcVF8qSfQrNVWFNNGbUJxv/A5a8=",
+        "lastModified": 1686135559,
+        "narHash": "sha256-pY8waAV8K/sbHBdLn5diPFnQKpNg0YS9w03MrD2lUGE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "e635192892f5abbc2289eaac3a73cdb249abaefd",
+        "rev": "381e92a35e2d196fdd6077680dca0cd0197e75cb",
         "type": "github"
       },
       "original": {

hosts/apps.nix

@@ -23,7 +23,8 @@
     networkmanagerapplet # nm-applet
     nextcloud-client
 
-    # System GUI applications
+    # GNOME apps
+    gnome.cheese
     gnome.nautilus
     gnome.file-roller
     gnome.gnome-calculator
@@ -43,7 +44,11 @@
     libreoffice
     gnome.ghex
     evince
+    pdfsam-basic
     steam
+    sqlitebrowser
+    vscodium
+    zoom-us
 
     # Games
     prismlauncher

hosts/home.nix

@@ -123,7 +123,7 @@ in
       # pandoc macro
       # pandoc document.md -> pandoc document.md -o document.pdf ...
       function pdf {
-        pandoc $1 -o ''${1%.*}.pdf -V colorlinks=true -V linkcolor=blue
+        pandoc $1 -o ''${1%.*}.pdf --pdf-engine=xelatex -V mainfont="mplus-1c-medium" -V colorlinks=true -V linkcolor=blue
       }
 
       # Change to directory when exiting ranger with Q