Update and rename camelize.md to convert-string-to-camelcase.md

snippets/convert-string-to-camelcase.md

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+### Convert string to camelcase
+
+Use `replace()` to remove underscores, hyphens and spaces and convert words to camelcase.
+
+```js
+const toCamelCase = str => 
+  str.replace(/^([A-Z])|[\s-_]+(\w)/g, (match, p1, p2, offset) =>  p2 ? p2.toUpperCase() : p1.toLowerCase());
+// camelize("some_database_field_name") -> 'someDatabaseFieldName'
+// camelize("Some label that needs to be camelized") -> 'someLabelThatNeedsToBeCamelized'
+// camelize("some-javascript-property") -> 'someJavascriptProperty'
+// camelize("some-mixed_string with spaces_underscores-and-hyphens") -> 'someMixedStringWithSpacesUnderscoresAndHyphens'
+```