input: Write a function to count the number of occurrences of a given keyword on a webpage.
  assert count_keyword_occurrences('https://en.wikipedia.org/wiki/Python_(programming_language)', 'Python') == 63
  assert count_keyword_occurrences('https://en.wikipedia.org/wiki/Java_(programming_language)', 'Java') == 100
  assert count_keyword_occurrences('https://en.wikipedia.org/wiki/C_(programming_language)', 'C') == 200
output: def count_keyword_occurrences(url, keyword):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
      text = soup.get_text()
      return text.count(keyword)