Add support for storing a page as a single file

[waybackarchiver]

Close #183

[codecov]

Codecov Report

Merging #184 (25f6454) into main (22b3bdb) will decrease coverage by 0.75%.
The diff coverage is 68.85%.

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
- Coverage   44.74%   43.99%   -0.76%     
==========================================
  Files          40       40              
  Lines        4921     4969      +48     
==========================================
- Hits         2202     2186      -16     
- Misses       2450     2512      +62     
- Partials      269      271       +2     

Impacted Files	Coverage Δ
reduxer/example.go	0.00% <0.00%> (ø)
service/utils.go	30.43% <0.00%> (-0.27%)	⬇️
reduxer/reduxer.go	46.61% <70.27%> (-9.41%)	⬇️
template/render/github.go	69.23% <100.00%> (+1.23%)	⬆️
template/render/matrix.go	72.50% <100.00%> (+0.70%)	⬆️
template/render/slack.go	71.05% <100.00%> (+0.78%)	⬆️
template/render/telegram.go	73.80% <100.00%> (+0.63%)	⬆️
pooling/pooling.go	94.73% <0.00%> (-2.64%)	⬇️

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