Add resources page

[Copilot]

Description

Adds a new resources page at /resources with placeholder content and navigation link.

Changes

• Created resources.md: New page at /resources with initial placeholder text
• Updated _includes/nav.html: Added Resources link to sub-navigation after About

Checklist

• Build runs successfully
• Follows existing page patterns (matches about.md structure)
• Navigation formatting consistent with existing links

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create a resources page</issue_title>
<issue_description>1. Create a resources page at /resources
2. Add it to the small navigation bar next to "Newsletter | Blog | About"
3. Add some initial text to the page "Coming soon. Resources to help you attend and eventually run your own workshop or conferences".</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create a resources page #780

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