chore: update readme images and documentation

[GuangmingLuo]

What type of PR is this?

Check the PR title.

• [x] This PR title match the format: \<type>(optional scope): \<description>
• [x] The description of this PR title is user-oriented and clear enough for others to understand.
• [x] Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo

(Optional) Translate the PR title into Chinese.

(Optional) More detailed description for this PR(en: English/zh: Chinese).

en: update readme images and documentation zh(optional):

• 删除无用的微信群图片
• 更新失效的 CNCF logo
• 文档部分添加可观测、更新治理特性

(Optional) Which issue(s) this PR fixes:

(Optional) The PR that updates user documentation:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.52%. Comparing base (532011f) to head (0c653a9). Report is 6 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1075 +/- ## =========================================== - Coverage 82.52% 82.52% -0.01% =========================================== Files 98 98 Lines 10025 10030 +5 =========================================== + Hits 8273 8277 +4 - Misses 1255 1257 +2 + Partials 497 496 -1 ```

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