fix: correct pageviews extraction

[kungfux]

Type of change

• Bug fix (non-breaking change which fixes an issue)

Description

Problem: NaN appears for pageview when over 1K pageview's value is returned by GoatCounter as JSON value contains formatted value like 1,234 that is expected according to documentation.

Solution: Remove any non-digit symbols from the value before trying to parse it.

Additional context

Reported by @SoumyaK4, discussed and tested under #2412.

[cotes2020]

Thanks for the fix. GoatCounter seems to use a space or comma as the thousands separator.

$ curl https://chirpy-demo.goatcounter.com/counter/%2Fposts%2Fgetting-started.json
{
  "count": "34 640",
  "count_unique": "34 640"
}