chore: update readme images and documentation

[GuangmingLuo]

What type of PR is this?

Check the PR title.

• This PR title match the format: <type>(optional scope): <description>
• The description of this PR title is user-oriented and clear enough for others to understand.
• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@             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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