Added comparison ops (>,>=...)

pkg/yqlib/doc/operators/headers/compare.md

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+# Compare Operators
+
+Comparison operators (`>`, `>=`, `<`, `<=`) can be used for comparing scalar values of the same time.
+
+The following types are currently supported:
+
+- numbers
+- strings
+- datetimes
+
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators (here)[https://mikefarah.gitbook.io/yq/operators/equals]
+- boolean operators (`and`, `or`, `any` etc) (here)[https://mikefarah.gitbook.io/yq/operators/boolean-operators]
+- select operator (here)[https://mikefarah.gitbook.io/yq/operators/select]