Support scraping opengraph/twitter meta tags

[azeemba]

<meta> tags with specific og: and twitter: properties that map to URLs are now fetched.

Specific properties that are supported are:

• og:image
• og:audio
• og:video
• og:image:url
• og:image:secure_url
• twitter:image

Fixes #268

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@a5b5bbc). Click here to learn what that means. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage        ?   87.02%           
=======================================
  Files           ?       26           
  Lines           ?      709           
  Branches        ?        0           
=======================================
  Hits            ?      617           
  Misses          ?       75           
  Partials        ?       17           

Impacted Files	Coverage Δ
link_finder.go	100.00% <100.00%> (ø)

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[raviqqe]

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