Clarify error message and remove catchpoint label from algod importer sample.

[winder]

Summary

Addresses usability feedback:

1. Info logs for fast catchup detection sounded like an error. Attempt to clarify that this is an expected state for a node that needs to be initialized.
2. Remove "catchpoint" setting from config sample. With the automated fast catchup, this setting no longer very useful. It doesn't need to be removed, but it doesn't need to be prominently displayed.

Test Plan

Existing unit tests.

[codecov]

Codecov Report

Merging #109 (6b77ba0) into master (442791a) will increase coverage by 2.64%.
The diff coverage is 77.29%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   67.66%   70.30%   +2.64%     
==========================================
  Files          32       37       +5     
  Lines        1976     2512     +536     
==========================================
+ Hits         1337     1766     +429     
- Misses        570      651      +81     
- Partials       69       95      +26     

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)
...duit/plugins/exporters/filewriter/file_exporter.go	81.63% <ø> (-1.06%)	⬇️
conduit/plugins/importers/algod/metrics.go	100.00% <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%)	⬆️
pkg/cli/internal/list/list.go	20.75% <ø> (ø)
...lugins/exporters/postgresql/postgresql_exporter.go	65.68% <51.21%> (-12.52%)	⬇️
... and 15 more

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