Add --build to websitebox up, comprehensive guide.md polish

- websitebox up now includes --build flag to always rebuild images,
  fixing Docker cache serving stale containers after code updates
- setup.sh launch command updated to source ~/.bashrc first
- guide.md: added step roadmap table with time estimates
- guide.md: added time estimates to all step headers
- guide.md: updated Launch step to use websitebox shortcut with
  source ~/.bashrc, added command reference table
- guide.md: updated all troubleshooting commands to use websitebox
  shortcut instead of cd + docker compose
- guide.md: added 'websitebox: command not found' troubleshooting
- guide.md: updated setup wizard terminal example to match current
  colored output format
- guide.md: added container build step to launch explanation

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

setup.sh

@@ -289,7 +289,7 @@ printf "    ${GREEN}✓ Success looks like:${RESET}  ${BOLD}${SERVER_IP}${RESET}
 printf "    ${RED}✗ Not ready yet:${RESET}     ${DIM}(blank output or a different IP — wait a few minutes and try again)${RESET}\n\n"
 printf " ${BLUE}3.${RESET} ${BOLD}Launch your website${RESET}\n"
 printf "    Once DNS is working, copy this command into the server terminal:\n\n"
-printf "      ${CYAN}websitebox up${RESET}\n\n"
+printf "      ${CYAN}source ~/.bashrc && websitebox up${RESET}\n\n"
 printf " ${BLUE}4.${RESET} ${BOLD}Visit your site${RESET}\n"
 printf "    Your website:  ${CYAN}https://${DOMAIN}${RESET}\n"
 printf "    Admin login:   ${CYAN}https://${DOMAIN}/wp-admin${RESET}\n"