remove pinger args and add STT tunnel deprecated warning

[oilbeater]

• Make sure you have followed the Document Convention

[gemini-code-assist]

Summary of Changes

Hello @oilbeater, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines and updates the project's documentation. It removes outdated information regarding kube-ovn-pinger arguments and introduces a crucial warning about the deprecation of STT tunnel support in Open vSwitch, ensuring users are aware of upcoming changes and unsupported features.

Highlights

• Documentation Removal: Removed documentation files related to kube-ovn-pinger arguments (kube-ovn-pinger-args.en.md and kube-ovn-pinger-args.md).
• STT Tunnel Deprecation Warning: Added a warning to the tunnel-protocol documentation (both English and Chinese versions) indicating that Open vSwitch upstream has removed support for STT tunnels in version 3.6, implying future lack of support.
• Navigation Update: Updated mkdocs.yml to remove the kube-ovn-pinger argument documentation from the site navigation and search index.

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[gemini-code-assist]

Code Review

This pull request removes the documentation for kube-ovn-pinger arguments and adds a deprecation warning for STT tunnels. The changes are logical and improve the documentation by removing obsolete information and warning users about a deprecated feature. I have provided a few minor suggestions to improve the wording and formatting of the new warning messages for better clarity and consistency.

[gemini-code-assist]

The phrase "in the future" is redundant because "will no longer" already implies a future state. Removing it will make the sentence more concise.

Suggested change

	Open vSwitch upstream removed support for STT tunnels in version 3.6 [commit](https://github.com/openvswitch/ovs/commit/19b89416203f3b3b212fb01c30c81ea1b77624eb){: target="_blank" }. This solution will no longer receive upstream support in the future.
	Open vSwitch upstream removed support for STT tunnels in version 3.6 [commit](https://github.com/openvswitch/ovs/commit/19b89416203f3b3b212fb01c30c81ea1b77624eb){: target="_blank" }. This solution will no longer receive upstream support.

[gemini-code-assist]

I have a few suggestions to improve this warning message for clarity and consistency:

1. Naming: For consistency with the official name, "OpenVswitch" should be "Open vSwitch".
2. Conciseness: The word 未来 (future) is redundant, as 将无法 already implies the future. It can be removed.
3. Formatting: There is an extra blank line that can be removed to match the formatting of the English version.

Suggested change

	OpenVswitch 上游在 3.6 版本[移除对 STT 类型 Tunnel 的支持](https://github.com/openvswitch/ovs/commit/19b89416203f3b3b212fb01c30c81ea1b77624eb){: target="_blank" }，该方案未来将无法得到上游支持。
	Open vSwitch 上游在 3.6 版本[移除对 STT 类型 Tunnel 的支持](https://github.com/openvswitch/ovs/commit/19b89416203f3b3b212fb01c30c81ea1b77624eb){: target="_blank" }，该方案将无法得到上游支持。