Merge the two quick starts into one tabbed, video-free page and retit… - #424

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@en/docs/ai-gateway/next/gateway-controller-management-api/authentication.md`:
- Line 2: Update the corresponding entry in the LLM index to use the exact label
“Secure the management API,” matching the page title and navigation rename while
leaving its link and other index entries unchanged.

In `@en/docs/ai-gateway/next/quick-start-guide.md`:
- Line 133: Replace the capability-marketing phrase “first-class support” in the
OpenAI LLM provider documentation with neutral wording such as “supports” or
“includes support for,” including the corresponding occurrence elsewhere in the
document.
- Around line 59-60: Update the first setup comment to expand AES as “Advanced
Encryption Standard (AES)-256” while preserving the existing description; apply
the same terminology update to the corresponding comment at the second
referenced occurrence.
- Around line 104-106: Update the heredoc explanation in the quick-start guide
to apply only to the YAML-based management requests. Clarify that traffic-test
commands send JSON directly and do not require a heredoc, YAML file, Git Bash,
WSL, or the Windows PowerShell tab for YAML handling.
- Around line 216-226: Update all affected curl examples to clearly label -k as
local-development-only for the local HTTPS listener. Add guidance for non-local
use to validate TLS with a trusted certificate instead of disabling certificate
verification, covering the examples at the referenced sections.
- Line 17: Update the Markdown page heading from “Quick Start Guide” to sentence
case: “Quick start guide.”
- Line 29: Update the prerequisite wording in the quick-start guide to replace
the plus sign between the Docker Engine and Compose plugin links with the word
“and,” preserving the existing links and Linux qualifier.
- Line 23: Update the prerequisite introduction near the container runtime list
to use the complete sentence “Use one of these Docker-compatible container
runtimes:” and leave the following list unchanged.
- Around line 51-52: Update the download command in the Linux/macOS quick-start
setup to use curl with failure and redirect handling, saving to
wso2apip-ai-gateway-1.2.0-rc.zip, instead of requiring wget; keep the existing
release URL unchanged.
- Line 90: Update the setup command in the quick-start guide to invoke the
script with the documented PowerShell 7.3+ runtime, using pwsh or an equivalent
PowerShell 7 session instead of powershell.

In `@en/docs/ai-gateway/next/README.md`:
- Line 21: Replace the spaced hyphen in the link description at
en/docs/ai-gateway/next/README.md lines 21-21 with an em dash without
surrounding spaces; apply the same punctuation change at
en/docs/ai-gateway/next/overview.md lines 21-21.

In `@en/mkdocs.yml`:
- Line 666: Update the navigation label for authentication.md from “Secure the
Management API” to the page’s sentence-case title, “Secure the management API,”
while preserving the existing page path.

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@en/docs/ai-gateway/next/quick-start-guide.md`:
- Line 46: Update the documented version in the introductory text to match the
1.2.0-rc version used by the download URL, archive name, and directory name in
the commands below.

---

Outside diff comments:
In `@en/docs/ai-gateway/next/quick-start-guide.md`:
- Line 354: Update the Kubernetes next-step link title in the quick-start guide
to use the direct verb “Deploy,” replacing “Take this gateway to production on
Kubernetes” while preserving the existing link destination.

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@en/docs/ai-gateway/next/quick-start-guide.md`:
- Line 126: Update the port-remapping guidance in the quick-start guide to
explicitly apply the remapped host port to all affected commands, including
provider and proxy management requests in the sections around the verification
and test commands. Ensure every command that targets host port 9090 uses the
configured replacement port.
- Around line 69-73: Update the “Start the complete stack” commands in the
quick-start guide to use detached Compose mode with `docker compose up -d` in
both platform tabs, allowing the subsequent gateway controller health check to
run once the controller is ready.
- Around line 23-33: Add curl and unzip to the Linux/macOS prerequisite list in
the quick-start guide, including installation guidance consistent with the
existing prerequisite format. Ensure the listed prerequisites cover the commands
used by the Linux/macOS instructions.