feat: add more configurations and a new theme

- a theme based on carbon and vim high contrast
- modify layouts in zellij and add support for swaps
- add snippets

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

.config/zellij/layouts/terminal.kdl

@@ -1,12 +1,8 @@
 layout {
-  pane {
-    borderless true 
-    size 1
-    plugin location="zellij:compact-bar"
-  }
-  pane split_direction="vertical" {
     pane {
-      name "Terminal"
+        name "Terminal"
+    }
+    pane size=1 borderless=true {
+        plugin location="zellij:compact-bar"
     }
-  }
 }