Remove the docs-pr release process.

[winder]

Summary

With recent doc reorganization, the docs-pr workflow no longer makes sense. The docs cannot be pushed directly to the developer portal anymore.

[codecov]

Codecov Report

Merging #126 (0c75411) into master (442791a) will increase coverage by 2.79%.
The diff coverage is 77.58%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   67.66%   70.45%   +2.79%     
==========================================
  Files          32       36       +4     
  Lines        1976     2542     +566     
==========================================
+ Hits         1337     1791     +454     
- Misses        570      654      +84     
- Partials       69       97      +28     

Impacted Files	Coverage Δ
conduit/data/block_export_data.go	100.00% <ø> (+92.30%)	⬆️
conduit/metrics/metrics.go	100.00% <ø> (ø)
conduit/pipeline/metadata.go	69.11% <ø> (ø)
conduit/plugins/config.go	100.00% <ø> (ø)
...duit/plugins/exporters/filewriter/file_exporter.go	81.63% <ø> (-1.06%)	⬇️
conduit/plugins/importers/algod/metrics.go	100.00% <ø> (ø)
...gins/processors/filterprocessor/fields/searcher.go	77.50% <ø> (ø)
...ins/processors/filterprocessor/filter_processor.go	83.82% <ø> (+3.54%)	⬆️
...plugins/processors/filterprocessor/gen/generate.go	34.28% <ø> (ø)
conduit/plugins/processors/noop/noop_processor.go	64.70% <ø> (+6.81%)	⬆️
... and 17 more

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