[BUG] Website: Generators navigation sidebar is misplaced for some generators

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

For specific generators on the website, the navigation sidebar is misplaced, appearing at the end of the page instead of on the side of it. Example (Java Generator):

Browser:

• Firefox 87.0 (64-Bit)
• Microsoft Edge Version 89.0.774.63 (Official build) (64-bit)

Display resolution: 1920 * 1080

It also appears as if the table is cut off on the right side, which might be causing this? However, not all generators are affected, e.g. the page for ada shows the navigation sidebar.
(Though it might be good to move the navigation sidebar a little bit more to the right; the table for ada is rather squashed.)

Steps to reproduce

1. Open https://openapi-generator.tech/docs/generators/java
2. Look on the right
   ❌ There is no navigation sidebar
3. Scroll down to the end of the page
   ❌ There is the navigation sidebar

Start by reproducing the layout on https://openapi-generator.tech/docs/generators/java in Firefox or Edge, then compare it with the ada generator page. Check the generator documentation page layout around the navigation sidebar and wide table; done means the sidebar appears beside the content and the table is not improperly cut off on affected pages.