ZEPPELIN-947: Change docs link to point the same Zeppelin version

[AhyoungRyu]

What is this PR for?

Currently, Zeppelin documentation link in Zeppelin home is pointing to http://zeppelin.apache.org/docs/latest/index.html. But maybe some people is not using the latest version. So the link should point to the same Zeppelin version that user is using now.

I just change the latest -> {{zeppelinVersion}}

What type of PR is it?

Improvement

Todos

What is the Jira issue?

ZEPPELIN-947

How should this be tested?

1. After applying this patch and browse Zeppelin home.
2. Just click Zeppelin Documentation link in here
   

Screenshots (if appropriate)

Questions:

• Does the licenses files need update? No
• Is there breaking changes for older versions? No
• Does this needs documentation? No

[corneadoug]

The CI failure is unrelated,
Tested, LGTM

[prabhjyotsingh]

I have seen in some of the organisations where the build/release team edits pom.xml and truncates -SNAPSHOT e.g. 0.6.0-SNAPSHOT becomes 0.6.0, for their own cache purposes.

So, IMO if we are going ahead with this, then may be we should have a redirect of http://zeppelin.apache.org/docs/{anything-else}/index.html to http://zeppelin.apache.org/docs/latest/index.html. Any thoughts ?

[Leemoonsoo]

@prabhjyotsingh redirection is good idea. Created an issue and pullrequest.

[AhyoungRyu]

@prabhjyotsingh Appreciate for sharing your thought! and
@Leemoonsoo Thanks for taking care that :)

[corneadoug]

@Leemoonsoo not sure your PR is doing it, the idea was to use latest instead of 0.6.0-SNAPSHOT

[Leemoonsoo]

@corneadoug updated #961, please check!

[prabhjyotsingh]

LGTM. We can merge this if no more discussion.

[felixcheung]

but latest is generally older than the unreleased snapshot build?
for instance, https://zeppelin.incubator.apache.org/docs/latest/ now points to 0.5.6 release doc, not 0.6.0-snapshot doc.

[AhyoungRyu]

@felixcheung Yeah right. As you can see, that's why I changed the link http://zeppelin.apache.org/docs/latest/index.html -> http://zeppelin.apache.org/docs/{{zeppelinVersion}}/index.html. Did I understand your comment incorrectly ?

[felixcheung]

Right. This is good. I was not sure about the redirect comment above but I didn't really have a better solution.

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