Remove deprecated GettingStarted.md page.

[winder]

Summary

This page should have been removed during the documentation reorganization.

[codecov]

Codecov Report

Merging #130 (6951f8e) into master (442791a) will increase coverage by 2.81%.
Report is 48 commits behind head on master.
The diff coverage is 77.64%.

@@            Coverage Diff             @@
##           master     #130      +/-   ##
==========================================
+ Coverage   67.66%   70.47%   +2.81%     
==========================================
  Files          32       36       +4     
  Lines        1976     2544     +568     
==========================================
+ Hits         1337     1793     +456     
- Misses        570      654      +84     
- Partials       69       97      +28     

Files Changed	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 19 more

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[tzaffi]

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