Add support for publish to Nostr

[waybackarchiver]

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

---

Checklist

• I have followed the contributing guidelines of this project as mentioned in CONTRIBUTING.md
• I have checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes needed to the documentation

[codecov]

Codecov Report

Base: 45.50% // Head: 45.55% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (aa5d465) compared to base (5c55f17).
Patch coverage: 59.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #311      +/-   ##
==========================================
+ Coverage   45.50%   45.55%   +0.05%     
==========================================
  Files          41       43       +2     
  Lines        5017     5141     +124     
==========================================
+ Hits         2283     2342      +59     
- Misses       2477     2530      +53     
- Partials      257      269      +12     

Impacted Files	Coverage Δ
publish/publish.go	56.52% <16.66%> (-2.79%)	⬇️
publish/nostr.go	37.50% <37.50%> (ø)
template/render/nostr.go	61.53% <61.53%> (ø)
template/render/render.go	79.85% <85.36%> (+2.19%)	⬆️
config/options.go	93.75% <100.00%> (+0.20%)	⬆️
config/parser.go	91.84% <100.00%> (+0.14%)	⬆️
template/render/mastodon.go	66.66% <100.00%> (ø)
template/render/twitter.go	70.37% <100.00%> (-6.23%)	⬇️

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