Add .gomarkdoc.yml and update docs

[sunglim]

Describe Request

This PR introduces .gomarkdoc.yml which includes default configuration of gomarkdoc.
This way, we can reuse the same configuration across multiple invocations such as pre-commit.sh and github workflow.
Also, docs are updated by executing pre-commit.sh.

Fixed # partially #172

Change Type

Docs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.41%. Comparing base (7168efc) to head (396a3ac).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
- Coverage   93.48%   93.41%   -0.08%     
==========================================
  Files         151      151              
  Lines        3932     3932              
==========================================
- Hits         3676     3673       -3     
- Misses        209      211       +2     
- Partials       47       48       +1     

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[sunglim]

repository.url is necessary for forked repository! Otherwise, in my forked repository, the docs becomes like this.

 <a name="Ad"></a>
-## type [Ad](<https://github.com/cinar/indicator/blob/master/volume/ad.go#L20-L23>)
+## type [Ad](<https://github.com/sunglim/indicator/blob/master/volume/ad.go#L20-L23>)

[cinar]

Ah, this is excellent, but it won't let me merge it as it is not a signed commit. Would it be possible to have it through a signed commit? Many thanks!!

[sunglim]

Ah, this is excellent, but it won't let me merge it as it is not a signed commit. Would it be possible to have it through a signed commit? Many thanks!!

Looking at.

[sunglim]

Ah, this is excellent, but it won't let me merge it as it is not a signed commit. Would it be possible to have it through a signed commit? Many thanks!!

Looking at.

Done. PTAL when you can find time.

[cinar]

Thank you so much!