Docs: add latest blog post - JetBrains extension

[huynhicode]

📑 Summary

This PR updates the blog page to include the latest blog post from Mermaid Chart:

• Introducing Mermaid Chart’s JetBrains IDE Extension

Resolves # n/a

📏 Design Decisions

Design decisions made by the Mermaid Chart team.

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🔖 targeted develop branch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2469419) 75.95% compared to head (749db74) 76.57%.
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5158      +/-   ##
==========================================
+ Coverage   75.95%   76.57%   +0.61%     
==========================================
  Files         164      164              
  Lines       13820    13820              
  Branches      693      693              
==========================================
+ Hits        10497    10582      +85     
+ Misses       3161     3080      -81     
+ Partials      162      158       -4     

Flag	Coverage Δ
e2e	81.74% <ø> (+0.77%)	⬆️
unit	42.94% <ø> (ø)

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see 13 files with indirect coverage changes