Added comments area to blog

I added comment section to blog. I also added Google reCAPTCHA security to prevent spam.

For previous versions of reCAPTCHA, It requires to check "Not a robot" or select the specific images to prove I am not a robot. The latest version, it doesn't require users to authorize. It checks user risk automatic from the server side.

I always mistake selecting images so I think it has become convenient.

Reference sites

Comment function

• ブログサイトをつくろう with Django

• create comment model

Google reCAPTCHA

• Using reCAPTCHA v3 with Django

• How to Add reCAPTCHA to a Django Site

• How To Implement Google Recaptcha v3 on Your Django App