feat: add assets via git-lfs

.gitattributes

@@ -0,0 +1 @@
+assets/** filter=lfs diff=lfs merge=lfs -text

assets/lockscreen.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:47098eed6a818a4e6181e2cdd6d1244b2adc46d748da5944a7bf89068eb1c8ad
+size 497830

assets/wallpaper.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0d5ab6c3434f2b1b8ebac566fef17fad16dbb6415d76ab06e6abf483b563bc25
+size 16097396

users/matej/home-manager.nix

@@ -26,6 +26,7 @@ in
 
     # git and co
     pkgs.git
+    pkgs.git-lfs
     packages.git-linearize
     packages.ggman