Update welcome blog.

Author: Guangzhen-Jin

docs/assets/images/blog/docs-blog-rss.png

@@ -46,12 +46,12 @@ Every RCAC cluster has its own dedicated guide organized into consistent chapter
 
 | Cluster User Guide | Notable Hardware |
 |---|---|
-| [Anvil](../../userguides/anvil/) | 128 cores/node, A100 (40GB) and H100 (80GB) GPUs |
-| [Gautschi](../../userguides/gautschi) | 192 cores/node, L40S (48GB) and H100 (80GB) GPUs |
-| [Bell (Under Migration)](https://www.rcac.purdue.edu/knowledge/bell)  | 128 cores/node, AMD MI50 (32GB) GPUs |
+| [Anvil](/userguides/anvil/) | 128 cores/node, A100 (40GB) and H100 (80GB) GPUs |
+| [Gautschi](/userguides/gautschi) | 192 cores/node, L40S (48GB) and H100 (80GB) GPUs |
+| [Bell](/userguides/bell)  | 128 cores/node, AMD MI50 (32GB) GPUs |
 | [Negishi (Under Migration)](https://www.rcac.purdue.edu/knowledge/negishi) | 128 cores/node, AMD MI210 (64GB) GPUs |
-| [Gilbreth (Under Migration)](https://www.rcac.purdue.edu/knowledge/gilbreth) | Various Nvida GPUs |
-| [Scholar (Under Migration)](https://www.rcac.purdue.edu/knowledge/scholar) | 168 cores/node, Various Nvida GPUs |
+| [Gilbreth](/userguides/gilbreth) | Various Nvida GPUs |
+| [Scholar](/userguides/scholar) | 168 cores/node, Various Nvida GPUs |
 
 ![Gautschi user guide](/assets/images/blog/docs-userguide.png)
 
@@ -111,6 +111,12 @@ We are also continously adding more RCAC workshop materials to the website.
 
 The [RCAC Blog](../index.md) is where staff share how-tos, tips, announcements, and deep dives. Posts are organized by **category** and **tag** and are fully searchable.
 
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