NT-105: Added netToolsApiElementRulesMock (the purpose of this task) with rulesets for sites and class elements.
NT-105: Replaced old bootstrap labels with new from v4.4.
NT-105: Refreshed "removed element text" use labels.
NT-105: Added internal template for bootstrap to .gitignore - it should not be included in the package as it may conflict with live elements on websites.
NT-105: Added more sample words to test with in the badwords block.
NT-105: Renamed badwords block to netToolsApiContentMock. In current state we only mock what should be reachable via API later on.
NT-105: Added protection layer for old element testings.