Implement insight page

[cakecatz]

What this PR does / why we need it:

This screenshot uses dummy data.

Ref: #1160

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

Add insight page

[pipecd-bot]

Code coverage for golang is 33.54%. This pull request increases coverage by 0.23%.

File	Function	Base	Head	Diff
pkg/yamlprocessor/yamlprocessor.go	GetValue	--	100.00%	+100.00%
pkg/yamlprocessor/yamlprocessor.go	ReplaceValue	--	90.00%	+90.00%

[nghialv]

/love

[pipecd-bot]

Code coverage for javascript is 81.41%. This pull request decreases coverage by -0.63%.

File	Base	Head	Diff
src/api/insight.ts	--	27.27%	+27.27%
src/modules/deployment-frequency.ts	--	61.11%	+61.11%
src/modules/insight.ts	--	73.33%	+73.33%
src/modules/index.ts	100.00%	100.00%	+0.00%

[khanhtc1202]

/approve
🚀🚀🚀🚀🚀

[pipecd-bot]

This pull request is APPROVED by khanhtc1202.

Approvers can cancel the approval by writing /approve cancel in a comment. Any additional commits also will change this pull request to be not-approved.