Add a blog: "MCP Server for PipeCD Docs Has Been Released"

[t-kikuc]

What this PR does:

as title

Why we need it:

to tell people about the newly released tool

Which issue(s) this PR fixes:

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.85%. Comparing base (44a0c00) to head (5b67f79).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5871   +/-   ##
=======================================
  Coverage   27.85%   27.85%           
=======================================
  Files         519      519           
  Lines       55793    55793           
=======================================
  Hits        15539    15539           
  Misses      39070    39070           
  Partials     1184     1184           

Flag	Coverage Δ
.	23.75% <ø> (ø)
.-pkg-app-pipedv1-plugin-example	0.00% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	63.60% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	64.93% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-plugin-sdk	49.25% <ø> (ø)
.-tool-actions-gh-release	19.58% <ø> (ø)
.-tool-actions-plan-preview	23.22% <ø> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[Warashi]

Thank you!
I commented on preparing the npm config.

[Warashi]

LGTM 👍🏻

[khanhtc1202]

Thank you 🚀