Werk #13195: Add validation to Documentation URL

Component	Setup
Title	Add validation to Documentation URL
Date	Dec 16, 2021
Level	Trivial Change
Class	Security Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p18 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Previous to this Werk the URLs to Documentation were not validated (e.g. in the rule creation dialog). This could have lead to malicious links, e.g. links containing javascript. These links now will be validated. The URL schemes are now restricted to "http" and "https".

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