Ignore websites based on their hosts

[pajlada]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

Allow hosters to opt out of the Chatterino Link Resolver server-side

Not every hoster has the ability or resources to block our link resolver - this provides a simple way to block entire hosts.
Validation of ownership will be made manually when entries are added to the ignoredHosts map

What it looks like in Chatterino:

[codecov]

Codecov Report

Merging #405 (1a0ed12) into master (4636d0d) will increase coverage by 0.09%.
The diff coverage is 64.00%.

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
+ Coverage   45.42%   45.52%   +0.09%     
==========================================
  Files         100      100              
  Lines        3676     3699      +23     
==========================================
+ Hits         1670     1684      +14     
- Misses       1958     1966       +8     
- Partials       48       49       +1     

Impacted Files	Coverage Δ
pkg/resolver/static_responses.go	10.60% <0.00%> (-0.69%)	⬇️
internal/resolvers/default/link_resolver.go	44.85% <70.58%> (+1.93%)	⬆️
internal/resolvers/default/initialize.go	100.00% <100.00%> (ø)

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