Link to PDF-guides in dropdown

[janhoy]

Add a link to PDF guides in the "old guides" section for completeness.

[HoustonPutman]

So in reference to apache/solr-site#77, we might be able to keep this line now? (Since all versions will be in the drop-down)

Redirect 301 /guide/index.html /guide/solr/9_0/index.html

Seeing as the only reason for the /guide/index.html page is to list all of the versions, right? I think it's better to have the entry page the latest ref-guide welcoming page rather than the listing of all the versions.

Not something we have to decide now, but would be a good thing IMO.

[janhoy]

So in reference to apache/solr-site#77, we might be able to keep this line now? (Since all versions will be in the drop-down)

I have thought the same thing. Sounds logical to end up with the start page of the latest guide when visiting /guide... Then we can remove that index page in solr-site.

However, if we anticipate other guides (such as solr-operator and perhaps solr-exporter?) to be added later, I wonder if /guide/solr/ would be a better "landing page" for the Ref Guide. Now, when you click the heading in top left corner of the guide, you are redirected to /guide, but if we also have /guide/operator/ then it makes more sense to let that text link to /guide/solr/.

Also, I discovered that the ref-guide places the JS, CSS etc in /guide/_/ which will totally break down if we add other antora sites alongside it?? Or will the "operator guide" be a module of the same Solr Ref guide, pulled from a different git repo?

[HoustonPutman]

However, if we anticipate other guides (such as solr-operator and perhaps solr-exporter?) to be added later, I wonder if /guide/solr/ would be a better "landing page" for the Ref Guide. Now, when you click the heading in top left corner of the guide, you are redirected to /guide, but if we also have /guide/operator/ then it makes more sense to let that text link to /guide/solr/.

Yeah, we should definitely update the buttons to go to /guide/solr (and /guide/operator when that exists). I don't think it's a huge issue to make the "landing page" default to the solr guide when users go to solr.apache.org/guide. We can make the intro-page better and give information and link to the Solr Operator guide as well, so that users can easily find it if that's what they are looking for.

Also, I discovered that the ref-guide places the JS, CSS etc in /guide/_/ which will totally break down if we add other antora sites alongside it?? Or will the "operator guide" be a module of the same Solr Ref guide, pulled from a different git repo?

Yep, it will be a module of the same Solr Ref guide, pulled in from the solr-operator repo. Not sure exactly how the workflow will go, but it will be done as intended in antora.