Implementing header block for japan site

[anuj-adobe]

1. Draft Authoring doc
2. Header top bar is simplified, only logo, input search and hamburger icon is added. Removed unwanted code.
3. Header top bar background is a gradient unlike fixed navy blue color in .com site.
4. Brand logo is set via nav.docx itself.(FYI - it is different from .com site).
5. "Order products" navigation is not present in Japan site, so removed code related to it.
6. Mobile navigation is kept similar to momentive.com site

Fix #52

Test URLs:

• Before: https://main--momentive--aemsites.hlx.live/
• After: https://header-jp--momentive--aemsites.hlx.page/drafts/anuj/header-impl/

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Commits

* [967cf85](https://github.com/aemsites/momentive/commit/967cf85cb62d82aa2023026f2709612215dfd488) :white_check_mark: (latest) * [57982e5](https://github.com/aemsites/momentive/commit/57982e521b4fe93fe069560e5478a6bfc207bbbb) :white_check_mark: * [fc60d2d](https://github.com/aemsites/momentive/commit/fc60d2d9be086614bab44c03cc832e13b3f9d1ab) :white_check_mark:

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