deploy: docs!: v1 docsite (#2831)

## Description

This PR creates the new v1 docsite.

### Documentation Section
- Clear use-case based folder structure and navigation

### Integrations Section
- New folder structure for each source and compatible tools
- Integration specific samples are moved into their folders

### Samples
- New samples gallery to search for samples from all across the
documentation site
- Search and filter based on tags

### Reference
- FAQ and CLI details

### Hugo
- New secondary top navbar
- Increased search capability

## Merge conflicts
- versioning.md has been added to path `docs/en/reference/versioning.md`
- style-guide has been added to path `docs/en/reference/style-guide.md`

## CloudFlare setup
- workflows added to deploy to cloudflare for new release, dev and
previous release
- individual ephemeral PR preview using cloudflare pages

## Individual PRs
- #2647
- #2648
- #2649
- #2650
- #2652
- #2664
- #2665
- #2666
- #2668
- #2670
- #2723
- #2779
- #2788
- #2790

## PR Checklist

> Thank you for opening a Pull Request! Before submitting your PR, there
are a
> few things you can do to make sure it goes smoothly:

- [x] Make sure you reviewed

[CONTRIBUTING.md](https://github.com/googleapis/genai-toolbox/blob/main/CONTRIBUTING.md)
- [x] Make sure to open an issue as a

[bug/issue](https://github.com/googleapis/genai-toolbox/issues/new/choose)
  before writing your code! That way we can discuss the change, evaluate
  designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)
- [x] Make sure to add `!` if this involve a breaking change

🛠️ Fixes #<issue_number_goes_here>

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Averi Kitsch <akitsch@google.com> 5b25ce0

Author: dishaprakash

dev/404.html

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Discord on MCP Toolbox for Databases</title><link>https://googleapis.github.io/genai-toolbox/dev/discord/</link><description>Recent content in Discord on MCP Toolbox for Databases</description><generator>Hugo</generator><language>en</language><atom:link href="https://googleapis.github.io/genai-toolbox/dev/discord/index.xml" rel="self" type="application/rss+xml"/></channel></rss>

dev/blogs/index.html

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Authentication on MCP Toolbox for Databases</title><link>https://googleapis.github.io/genai-toolbox/dev/documentation/configuration/authentication/</link><description>Recent content in Authentication on MCP Toolbox for Databases</description><generator>Hugo</generator><language>en</language><atom:link href="https://googleapis.github.io/genai-toolbox/dev/documentation/configuration/authentication/index.xml" rel="self" type="application/rss+xml"/><item><title>Google Sign-In</title><link>https://googleapis.github.io/genai-toolbox/dev/documentation/configuration/authentication/google/</link><pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate><guid>https://googleapis.github.io/genai-toolbox/dev/documentation/configuration/authentication/google/</guid><description>&lt;h2 id="getting-started">Getting Started&lt;/h2>
+&lt;p>Google Sign-In manages the OAuth 2.0 flow and token lifecycle. To integrate the
+Google Sign-In workflow to your web app &lt;a href="https://developers.google.com/identity/sign-in/web/sign-in">follow this guide&lt;/a>.&lt;/p>
+&lt;p>After setting up the Google Sign-In workflow, you should have registered your
+application and retrieved a &lt;a href="https://developers.google.com/identity/sign-in/web/sign-in#create_authorization_credentials">Client ID&lt;/a>. Configure your auth service
+in with the &lt;code>Client ID&lt;/code>.&lt;/p>
+&lt;h2 id="behavior">Behavior&lt;/h2>
+&lt;h3 id="authorized-invocations">Authorized Invocations&lt;/h3>
+&lt;p>When using &lt;a href="https://googleapis.github.io/genai-toolbox/dev/documentation/configuration/tools/#authorized-invocations">Authorized Invocations&lt;/a>, a tool will be
+considered authorized if it has a valid Oauth 2.0 token that matches the Client
+ID.&lt;/p></description></item></channel></rss>