chore: change README.md and release images to beta (#7447)

.github/workflows/release.yml

@@ -126,7 +126,7 @@ jobs:
         # https://github.com/openethereum/openethereum/blob/6c2d392d867b058ff867c4373e40850ca3f96969/.github/workflows/build.yml
         run: |
           body=$(cat <<- "ENDBODY"
-          ![image](https://github.com/paradigmxyz/reth/assets/17802178/b906d475-a594-4eb9-80cc-222eb441fd08)
+          ![image](https://github.com/paradigmxyz/reth/assets/17802178/d02595cf-7130-418f-81a3-ec91f614abf5)
 
           ## Testing Checklist (DELETE ME)
 

README.md

@@ -6,7 +6,7 @@
 
 **Modular, contributor-friendly and blazing-fast implementation of the Ethereum protocol**
 
-![](./assets/reth-alpha.png)
+![](./assets/reth-beta.png)
 
 **[Install](https://paradigmxyz.github.io/reth/installation/installation.html)**
 | [User Book](https://paradigmxyz.github.io/reth)