chore(Web components): configure docs in storybook

[sangeethababu9223]

Closes #6423

The current storybook for web components does not include docs, configure the same.

What did you change?

Updated storybook configuration to show content from *.mdx files to show in the docs section.

How did you test and verify your work?

Storybook

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.62%. Comparing base (01ece2b) to head (1fb0ae8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6478      +/-   ##
==========================================
- Coverage   79.64%   79.62%   -0.02%     
==========================================
  Files         394      394              
  Lines       12886    12886              
  Branches     4268     4268              
==========================================
- Hits        10263    10261       -2     
- Misses       2623     2625       +2     

Components	Coverage Δ
ibm-products	∅ <ø> (∅)
ibm-products-web-components	∅ <ø> (∅)

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[elycheea]

Should double check if #6300 changes are included since we closed that as a duplicate.

[sangeethababu9223]

Should double check if #6300 changes are included since we closed that as a duplicate.

I've double checked with closed issue:

• Docs tab is working as expected now.
• Imports are updated.
• For links to samples, since we don't have stackblitz samples set up for web components and the ones in .mdx files point to core carbon, this section is removed. we could update this once we have set up stackblitz samples for web components package.