improve docs.ipfs.tech link visual representation

[george-hub331]

Closes #366

This PR improves the visual representation of documentation links in the IPLD Explorer, making it easier for users to identify terms that have additional documentation.

Changes:

• Added info icon next to documentation links for better visual identification
• Improved hover states and accessibility features
• Added tooltip showing "View in IPFS Documentation" on hover
• Maintained existing link functionality while improving visual feedback

Testing:

• Verified icon visibility across different themes
• Checked accessibility features
• Tested responsive behavior