work on adding SEO tags to posts

[yshmarov]

Description

relevant reading

• https://dev.to/junko911/make-your-rails-application-seo-friendly-by-setting-meta-tags-6o5
• https://www.indiehackers.com/post/seo-is-a-waste-of-time-for-most-indie-hackers-a8043cb033
• https://growtika.com/saas-seo/

How to test

Self-check

• [ ] self-reviewed
• [ ] added tests
• [ ] focused (related only to the ticket scope)

Visual Changes

Before

After