[gh-pages][ZEPPELIN-1216] Add a matrix table for "Zeppelin version X available interpreters"

[AhyoungRyu]

What is this PR for?

I added a matrix table for "Zeppelin version X available interpreters(with specific version)" to zeppelin.apache.org/download.html. Please see the attached screenshot images :)

What type of PR is it?

Improvement & Documentation

Todos

• - Change _site -> _site/ in .gitignore
• - Update safe_yaml version 0.9.7 -> 1.0.4 like master branch
• - Add 0.6.1 column

What is the Jira issue?

ZEPPELIN-1216

Screenshots (if appropriate)

Questions:

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

[AhyoungRyu]

@Leemoonsoo Can you review this one? I updated the PR description :)

[minahlee]

Looks great!
How about move recent release to left?
FYI, Geode is not included in binary package like scalding.

[AhyoungRyu]

@minahlee Yeah it makes sense.

How about move recent release to left?

It would be better since this table becomes wider. I addressed it. And also Geode :)

[Leemoonsoo]

Looks good. Shell we merge it?

[Leemoonsoo]

LGTM and Merge if there're no further discussions.

[AhyoungRyu]

Since Zeppelin is about to release 0.6.1 version, I'll add 0.6.1 column as well.

[Leemoonsoo]

👌

[AhyoungRyu]

@Leemoonsoo I removed 0.5.0 column(it's too outdated) instead of adding 0.6.1 (latest) one. Please check the updated gif image in the PR description :)

[AhyoungRyu]

Using this PR I updated Spark logo to new one as #1279 did.

[Leemoonsoo]

LGTM. Merge to gh-pages branch if there're no more discussions.
Thanks @AhyoungRyu for great work!