Add guidebook to guest portal

Problem Statement:

• The Guest Portal doesn't currently support adding custom/static links or modules
• Hosts want to include their digital guidebook (e.g., Hostfully) directly inside the portal so guests can access it without needing a separate message
• Guests currently have to rely on messages to access the guidebook, which isn't as convenient

Current Workaround:

• Send the guidebook link to guests via automated messages using the %guidebook% shortcode
• This works, but it requires the guest to click a link in a message rather than having it available in the portal

Impact:

• Guests don't have the guidebook readily accessible in one place within the portal
• Hosts can't provide a more integrated experience for guests

Proposed Solution:

• Allow hosts to add custom links or modules (like a digital guidebook) to the Guest Portal UI
• This could be a configurable section where hosts can add URLs to external resources

Unlock:

• Guests would have the guidebook and other resources readily available in the portal
• Hosts could provide a more seamless, integrated experience for their guests