Preview:
const pages = Array.prototype.slice.call(document.querySelectorAll('a.page-numbers'))
pages.map((page, index) => {
  const oldUrl = page.getAttribute('href')
  const patt = /\/[0-9]{1,2}\//;
  const result = oldUrl.match(patt)
  const result2 = '/page' + result
  const url = oldUrl.replace(result, result2)
  page.setAttribute('href', url)
});
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