fix: update frontend setup instructions and backend prerequisites (#597)

Signed-off-by: Shubham Jain <[email protected]>

Author: slayerjain

versioned_docs/version-3.0.0/quickstart/java-spring-postgres.md

@@ -37,14 +37,14 @@ This project has two parts - the frontend and backend, since Keploy is a backend
 
 ## Setup the frontend
 
+### Prerequisites For Frontend:
+
+1. Node version 16.x and above
+
 ```bash
 git clone https://github.com/keploy/samples-java.git
 cd samples-java/spring-petclinic/spring-petclinic-angular
-npm uninstall -g angular-cli @angular/cli
-npm cache clean
-npm install -g @angular/cli@latest
-npm install --save-dev @angular/cli@latest
-npm i
+npm i --legacy-peer-deps
 ```
 
 ## Start the frontend
@@ -64,13 +64,12 @@ You can start the backend using Keploy in 2 ways:
 - [Using Keploy's binary](#instructions-for-starting-using-binary)
 - [Using Keploy's docker image](#instructions-for-starting-using-docker)
 
-# Instructions For Starting Using Binary
+# Instructions For Starting Using API backend Binary
 
-Prerequisites For Binary:
+Prerequisites For API backend Binary:
 
-1. Node 20.11.0 LTS
-2. OpenJDK 17.0.9
-3. MVN version 3.6.3
+1. OpenJDK 17+
+2. MVN version 3.6+
 
 ## Setup the backend