What to run
Open Favicon Generator. It stays in the browser.
How to read the result
The PNG is a letter on a square at 32 or 180.
It is not an .ico set and not a maskable icon pack.
Download and reference it yourself.
What to open next
Open Contrast Checker on the same two colours so the letter survives at 16px. It stays in the browser.
Open Open Graph Generator for the social image, which is a different asset. It stays in the browser.