feat: enhanced meta for social sharing (basic)

[JoeyC-Dev]

Proposed changes: Enhance meta in header for social sharing based on PR (https://github.com/saicaca/fuwari/pull/56). The current version still presents bad in social media like Telegram.

Before/After: Domain -> Site name

I don't think I have time to add "keyword" and "image" in meta list. As suggestion, og:type=article should be added when the page type is post. Same for og:image, article:published_time, article:tag, etc. This will make SEO outcome better.

If I really have free time for this (I want to concentrate on my blog content for now) and not have been merged yet, I will try update some others in the same PR.