Added 1ML and Mempool Lightning Explorer Links

[wandiamugo]

Lightning Network Gallery Update

Description

Brief description of what this PR changes:

• Adding new project(s)
• Updating existing project information
• Fixing data errors
• Other: ___________________

Changes Made

New Projects Added:

• Project Name 1 (Category)
• Project Name 2 (Category)

Updated Projects:

• Project Name (what was changed)

Data Quality Checklist:

• All project names are accurate
• URLs are working and correct
• Tags are relevant and consistent with existing tags
• Project descriptions are clear and informative
• JSON syntax is valid (will be automatically checked)

Testing

• I have tested the JSON locally
• Links open correctly
• Project information is accurate

Additional Notes

---

For Maintainers:

• Data quality review completed
• No duplicate projects
• Consistent formatting
• Ready to merge

[naiyoma]

I suggest splitting this okjodom@52a84ed into two commit messages: one for the IML link and the other for Mempool Space

[wandiamugo]

@naiyoma I've split the commit as requested. Kindly check it out.

[naiyoma]

resolves https://github.com/okjodom/lngal/issues/26