Add index pages and use grid cards

docs/users/index.md

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+---
+description: Pages aimed at server owners who want to utilize PlaceholderAPI.
+---
+
+# User Guides
+
+The pages listed under this section are meant for server owners who want to use PlaceholderAPI.
+
+----
+
+<div class="grid cards hide-list" markdown>
+
+-   ### Using Placeholders
+    
+    ----
+    
+    User Guide on how to use placeholders in a plugin.
+    
+    - [:octicons-chevron-right-16: Go to Page](using-placeholders.md)
+
+-   ### Placeholder List
+    
+    ----
+    
+    Community-curated list of available PlaceholderExpansions and their placeholders.
+    
+    - [:octicons-chevron-right-16: Go to Page](placeholder-list.md)
+
+-   ### Plugins using PlaceholderAPI
+    
+    ----
+    
+    List of Plugins that support PlaceholderAPI and/or provide their own placeholders to use.
+    
+    - [:octicons-chevron-right-16: Go to Page](plugins-using-placeholderapi.md)
+
+</div>