ThreatMapper Architecture - rendering issues

Build the full website (`make build`)

Check the ThreatMapper Architecture page (http://localhost/docs/threatmapper/architecture/)

Sometimes, the sidebar does not render (you only see the main content). Check the `sidebars/threatmapper.js` file; this problem appears to be related to the link / id:

```
link: {
type: 'doc',
id: 'threatmapper/architecture/index'
},
```

If it fails, try `threatmapper/architecture`.

Need to debug this, as the problem is difficult to detect and is intermittent. It does not appear to affect any other docs pages

Run `make build` and inspect `sidebars/threatmapper.js`, especially the architecture entry. Open the local ThreatMapper Architecture page and compare the `threatmapper/architecture/index` and `threatmapper/architecture` link forms. Done means the sidebar renders consistently on that page and the intermittent behavior is understood.

Written by the indexing model from the issue text.