fix:solve the warnings in 'make doc'

[thredreams]

make doc command generates six warnings：

• WARNING: duplicate label prerequisites, WARNING: 'myst' reference target not found:
• WARNING: document isn't included in any toctree
• index.rst:2: WARNING: Title underline too short.
• CODE_OF_CONDUCT.md:1: WARNING: Document headings start at H2, not H1 [myst.header]
• WARNING: Could not lex literal_block as "yaml". Highlighting skipped.
• WARNING: Could not lex literal_block as "console". Highlighting skipped.

I have solved the last four warnings, but the first two "warnings" have not been solved

The warning1 is because there are many subtitles with the same name, the file link is invalid

The warning2 is that several files have not been determined and added to the directory

The last two warnings cause code block highlighting failure，I'm not sure if my changes are appropriate

Signed-off-by: thredreams 1220474743@qq.com

[codecov-commenter]

Codecov Report

Merging #806 (80f302d) into main (c315315) will increase coverage by 0.16%.
The diff coverage is n/a.

❗ Current head 80f302d differs from pull request most recent head 4a925b2. Consider uploading reports for the commit 4a925b2 to get more accurate results

@@            Coverage Diff             @@
##             main     #806      +/-   ##
==========================================
+ Coverage   62.43%   62.59%   +0.16%     
==========================================
  Files          46       46              
  Lines        6154     6154              
==========================================
+ Hits         3842     3852      +10     
+ Misses       2071     2064       -7     
+ Partials      241      238       -3     

Impacted Files	Coverage Δ
internal/provider/kubernetes/controller.go	51.25% <0.00%> (+0.96%)	⬆️
internal/provider/kubernetes/helpers.go	74.19% <0.00%> (+4.03%)	⬆️

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[arkodg]

LGTM ! thanks for fixing these warnings