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

tldr/jest

@@ -0,0 +1,41 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jest
+
+> A zero-configuration JavaScript testing platform.
+> More information: <https://jestjs.io>.
+
+- Run all available tests:
+
+`jest`
+
+- Run the test suites from the given files:
+
+`jest {{path/to/file1 path/to/file2 ...}}`
+
+- Run the test suites from files within the current and subdirectories, whose paths match the given regular expression:
+
+`jest {{regular_expression1}} {{regular_expression2}}`
+
+- Run the tests whose names match the given regular expression:
+
+`jest --testNamePattern {{regular_expression}}`
+
+- Run test suites related to a given source file:
+
+`jest --findRelatedTests {{path/to/source_file.js}}`
+
+- Run test suites related to all uncommitted files:
+
+`jest --onlyChanged`
+
+- Watch files for changes and automatically re-run related tests:
+
+`jest --watch`
+
+- Display help:
+
+`jest --help`