Add progress descriptions to install.sh for slow connections

Each major install step now shows what it does and how long to expect:
- System update: 2-10 min on fresh servers
- Security tools: under a minute
- Docker: 1-3 min (largest download)
- Clone: a few seconds

Updated guide.md terminal output to match.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

guide.md

@@ -198,8 +198,11 @@ Detected: ubuntu 22.04
   Securing your server...
 ───────────────────────────────────────────────────────────
 Updating system packages...
+  Downloading the latest security patches for your operating system.
+  On a fresh server this can take 2-10 minutes. Sit tight.
 System packages updated.
-Installing firewall, fail2ban, and automatic updates...
+Installing security tools (firewall, fail2ban, auto-updates)...
+  These protect your server from common attacks. Usually under a minute.
 Configuring firewall...
 Firewall enabled: SSH, HTTP, and HTTPS allowed. All other ports blocked.
 Fail2ban enabled: brute-force SSH protection active.
@@ -213,8 +216,11 @@ Docker log rotation configured (10MB max per log, 3 files per container).
     Docker log limits: configured (30MB max per container)
 
 Installing Docker...
+  Docker packages and runs your website in isolated containers.
+  This is the largest download — usually takes 1-3 minutes.
 Docker installation complete.
 Cloning WebsiteBox...
+  Downloading the project files from GitHub. Just a few seconds.
 
 ═══════════════════════════════════════════════════════════
   WebsiteBox Setup Wizard