Add support page for Mroonga Technical Support

[yoshimotoyuk]

It is to add the information about technical support.

• Added new support index page
• Added the link to the menu

[abetomo]

Added the link to the menu

It’s not on the list!

You can add it around here:

mroonga.org/_layouts/en.html

Lines 13 to 23 in d5b4534

	<nav>
	<ul>
	<li><a href="/docs/">Documentation</a></li>
	<li><a href="/publication/">Publication</a></li>
	<li><a href="/users/">Users</a></li>
	<li><a href="/related-projects.html">Related projects</a></li>
	<li><a href="/docs/community.html">Community</a></li>
	<li><a href="/docs/developer.html">For developers</a></li>
	<li><a href="/blog/">Blog</a></li>
	</ul>
	</nav>

[yoshimotoyuk]

sorry I made the PR before I commit the change for menu and I deleted the window for that.
Should have been added now.

[Copilot]

Pull request overview

Adds an English “Support” landing page to the website and exposes it from the English top navigation, aligning with the existing Japanese support page.

Changes:

• Added a new English support index page (support/index.html) listing technical support providers.
• Added a “Support” link to the English layout navigation (_layouts/en.html).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
support/index.html	Introduces the English support page content for Mroonga technical support.
_layouts/en.html	Adds the “Support” entry to the English site navigation menu.

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[Copilot]

There are several English grammar/spacing issues here (e.g., "participated to" → "participated in", "related project" → "related projects", and missing spaces after commas between the linked project names). Please revise this sentence for correct grammar and readability.

Suggested change

	<p>ClearCode has participated to Groonga and related project development since 2008. Based on those community work and development experience, the company offers technical support service for systems structured with <a href='https://groonga.org'>Groonga</a>,<a href='https://pgroonga.github.io/'>PGroonga</a>,Mroonga.</p>
	<p>ClearCode has participated in the development of Groonga and related projects since 2008. Based on this community work and development experience, the company offers technical support service for systems structured with <a href='https://groonga.org'>Groonga</a>, <a href='https://pgroonga.github.io/'>PGroonga</a>, and Mroonga.</p>