Docs: Fix latest and nightly link on javadoc (according to site README.md)

[jbonofre]

No description provided.

[jbonofre]

As discussed on #10378 @Fokko @manuzhang

[manuzhang]

@jbonofre
I built the site based on the PR locally. The Javadoc links from nightly / latest are working now, but links from 1.7.1 / 1.7.0 / 1.6.1 / 1.6.0 all point to latest. Links from older releases are also working fine.

[jbonofre]

@manuzhang I didn't change the versions. Let me check.

[jbonofre]

@manuzhang I checked, and I see 1.7.1, 1.7.0 etc folders in javadoc (without sym link). I guess you are talking about the links in the generated site/index.html ? Can you point me to the exact page ?

[jbonofre]

Ah I found it and it's not related to this change.
If you go to iceberg.apache.org (https://iceberg.apache.org/docs/nightly), you can see the Javadoc links are pointing to latest.
So this is an issue that exists already. I'm ok to fix it as part of this PR 😄

[manuzhang]

I see. We can fix it separately.

[jbonofre]

I chatted with @Fokko and the javadoc version links to latest is a known issue and a bit complicated to fix.

I propose to merge this PR (with latest & nightly links fix) and create another PR to fix the javadoc version links.

[jbonofre]

@Fokko what do you think about this one ?

[jbonofre]

@Fokko gentle reminder 😄 Thanks !