[Backport 2.x] minor updates to README.md; removed dead link to credits and an unnec…

[opensearch-trigger-bot]

Backport d654ad6 from #65

[codecov-commenter]

Codecov Report

Merging #68 (d654ad6) into 2.x (da9c881) will increase coverage by 5.09%.
The diff coverage is 71.62%.

❗ Current head d654ad6 differs from pull request most recent head dabd7ee. Consider uploading reports for the commit dabd7ee to get more accurate results

@@             Coverage Diff              @@
##                2.x      #68      +/-   ##
============================================
+ Coverage     60.43%   65.52%   +5.09%     
- Complexity      155      172      +17     
============================================
  Files            29       29              
  Lines           867      879      +12     
  Branches        119      119              
============================================
+ Hits            524      576      +52     
+ Misses          304      254      -50     
- Partials         39       49      +10     

Impacted Files	Coverage Δ
...search/search/relevance/SearchRelevancePlugin.java	0.00% <0.00%> (ø)
...arch/search/relevance/client/OpenSearchClient.java	77.77% <ø> (ø)
...arch/search/relevance/configuration/Constants.java	80.00% <ø> (ø)
.../configuration/ResultTransformerConfiguration.java	100.00% <ø> (ø)
...evance/configuration/TransformerConfiguration.java	50.00% <ø> (-16.67%)	⬇️
.../search/relevance/transformer/TransformerType.java	60.00% <ø> (ø)
...ntelligentranking/client/KendraClientSettings.java	55.26% <ø> (+55.26%)	⬆️
...telligentranking/client/SimpleAwsErrorHandler.java	0.00% <ø> (ø)
...telligentranking/client/SimpleResponseHandler.java	0.00% <ø> (ø)
.../KendraIntelligentRankingConfigurationFactory.java	0.00% <0.00%> (ø)
... and 41 more

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