fix: update ptokens link

[donnyquixotic]

Fixes #79

Description

update deprecated url

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have cleaned up the code in the areas my change touches
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings
• [x] I have removed any unnecessary console messages
• [x] I have tested for mobile functionality and responsiveness
• [x] I have updated relevant documentation and/or opened a separate issue to cover the updates (Issue URL: )

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