chore: update docker-compose and documentation for PostgreSQL configuration

- Added NEXT_FRONTEND_URL environment variable to docker-compose.yml for frontend integration.
- Updated hero-section.tsx to change the "Get Started" button link from "/login" to "/register".
- Enhanced electric-sql documentation with detailed instructions for locating and editing the postgresql.conf file.

docker-compose.yml

@@ -58,6 +58,7 @@ services:
       - LANGSMITH_TRACING=false
       - ELECTRIC_DB_USER=${ELECTRIC_DB_USER:-electric}
       - ELECTRIC_DB_PASSWORD=${ELECTRIC_DB_PASSWORD:-electric_password}
+      - NEXT_FRONTEND_URL=http://frontend:3000
     depends_on:
       - db
       - redis

surfsense_web/components/homepage/hero-section.tsx

@@ -184,7 +184,7 @@ function GetStartedButton() {
 	return (
 		<motion.div whileHover={{ scale: 1.02, y: -2 }} whileTap={{ scale: 0.98 }}>
 			<Link
-				href="/login"
+				href="/register"
 				className="group relative z-20 flex h-11 w-full cursor-pointer items-center justify-center gap-2 rounded-xl bg-black px-6 py-2.5 text-sm font-semibold text-white shadow-lg transition-shadow duration-300 hover:shadow-xl sm:w-56 dark:bg-white dark:text-black"
 			>
 				Get Started

surfsense_web/content/docs/how-to/electric-sql.mdx

@@ -147,7 +147,18 @@ If you're using a local PostgreSQL installation, follow these steps:
 
 **1. Enable logical replication in PostgreSQL:**
 
-Locate your `postgresql.conf` file and add the following settings:
+Open your `postgresql.conf` file using vim (or your preferred editor):
+
+```bash
+# Common locations:
+# macOS (Homebrew): /opt/homebrew/var/postgresql@15/postgresql.conf
+# Linux: /etc/postgresql/15/main/postgresql.conf
+# Windows: C:\Program Files\PostgreSQL\15\data\postgresql.conf
+
+sudo vim /path/to/postgresql.conf
+```
+
+Add the following settings:
 
 ```ini
 # Enable logical replication (required for Electric SQL)
@@ -156,7 +167,7 @@ max_replication_slots = 10
 max_wal_senders = 10
 ```
 
-After saving the changes, restart your PostgreSQL server for the configuration to take effect.
+After saving the changes (`:wq` in vim), restart your PostgreSQL server for the configuration to take effect.
 
 **2. Update environment variable:**