Add release panel to ja docs

[khanhtc1202]

What this PR does / why we need it:

• Add release panel to JA docs
• Update make site command reflect change

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[cakecatz]

/lgtm

[pipecd-bot]

Code coverage for golang is 32.60%. This pull request does not change code coverage.

[nghialv]

/approve

[nakabonne]

It doesn't work fine on my laptop.

❯ make site
env RELEASE=v0.10.2 hugo server --source=docs
Building sites … ERROR 2021/06/29 11:35:43 [en] REF_NOT_FOUND: Ref "/docs/quickstart/": "/Users/s07726/src/github.com/pipe-cd/pipe/docs/content/en/_index.html:1:1": page not found
Built in 1415 ms
Error: Error building site: logged 1 error(s)
make: *** [site] Error 255

@khanhtc1202 did it go well on your environment?

[nakabonne]

/approve cancel

[khanhtc1202]

It doesn't work fine on my laptop.

❯ make site
env RELEASE=v0.10.2 hugo server --source=docs
Building sites … ERROR 2021/06/29 11:35:43 [en] REF_NOT_FOUND: Ref "/docs/quickstart/": "/Users/s07726/src/github.com/pipe-cd/pipe/docs/content/en/_index.html:1:1": page not found
Built in 1415 ms
Error: Error building site: logged 1 error(s)
make: *** [site] Error 255

@khanhtc1202 did it go well on your environment?

Sure 👀 The error showed that you don't have docs/quickstart even for en version of the documentation, that's weird 🤔
Could you checkout master and rerun the command 🙏

[nakabonne]

for sure. It doesn't work even at the master branch.

pipe on ᚠ master [$] took 2m42s
❯ make site
hugo server --source=docs
Building sites … ERROR 2021/06/29 11:41:40 [en] REF_NOT_FOUND: Ref "/docs/quickstart/": "/Users/s07726/src/github.com/pipe-cd/pipe/docs/content/en/_index.html:1:1": page not found

[nakabonne]

okay, let me approve it as it turns out my own issue
/approve

[pipecd-bot]

This pull request is APPROVED by nakabonne.

Approvers can cancel the approval by writing /approve cancel in a comment. Any additional commits also will change this pull request to be not-approved.

[khanhtc1202]

okay, let me approve it as it turns out my own issue
/approve

thx 🙏

[nakabonne]

for sure. It doesn't work even at the master branch.

That was because hugo that I'm using is too old

❯ hugo version
Hugo Static Site Generator v0.68.3/extended darwin/amd64 BuildDate: unknown

Updating did fix it.