Beautiful soup read write

Read in index.html using beautiful soup, and write out. This automatically fixes some errors like unclosed tags.

```py
from bs4 import BeautifulSoup
html_file = "index.html"
with open(html_file, 'r') as file:
    html_content = file.read()
soup = BeautifulSoup(html_content, 'html.parser')
with open(html_file, 'w', encoding="utf-8") as file:
    file.write(str(soup))
```