Make the header and its content of *Platform* hidden and expandable in Bug Reports

[egberts]

Maybe enhance the template to Pelican's Bug Report to move the 'Platform' to the end and make it 'expandable' using HTML <detail></detail>

I've included it as well (notice the Click to expand?):

---

Issues

Plug in your issues here.

Platform

Click to expand

Platform

• OS version and name: Linux 6.1.0-21-amd64 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
• Python version: 3.11.2
• Pelican version: HEAD (513abbf)
• Link to theme: m.css
• Links to plugins: pelican-plugins
• Link to your site: n/a
• Link to your source: n/a

To do that, the template to the Bug Report would have this snippet:

**Platform**
<details>
<summary>Click to expand</summary>

## Platform

- **OS version and name**: Linux 6.1.0-21-amd64 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
- **Python version**: 3.11.2
- **Pelican version**: HEAD (513abbf)
- **Link to theme**: [m.css](https://github.com/egberts/m.css)
- **Links to plugins**: [pelican-plugins](https://github.com/getpelican/pelican-plugins)
- **Link to your site**: n/a
- **Link to your source**: n/a
</detail>