Move pages under tldr, lint run.sh, update docs

tldr/cradle-elastic

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cradle elastic
+
+> Manage the Elasticsearch instances for a Cradle instance.
+> More information: <https://cradlephp.github.io/docs/3.B.-Reference-Command-Line-Tools.html#elastic>.
+
+- Truncate the Elasticsearch index:
+
+`cradle elastic flush`
+
+- Truncate the Elasticsearch index for a specific package:
+
+`cradle elastic flush {{package}}`
+
+- Submit the Elasticsearch schema:
+
+`cradle elastic map`
+
+- Submit the Elasticsearch schema for a specific package:
+
+`cradle elastic map {{package}}`
+
+- Populate the Elasticsearch indices for all packages:
+
+`cradle elastic populate`
+
+- Populate the Elasticsearch indices for a specific package:
+
+`cradle elastic populate {{package}}`