update tool's document

[ngoan1608]

Hi Holger, Hi Thomas,

This PR contains updates in document for below tickets:

• https://github.com/test-fullautomation/robotframework-robotlog2db/issues/24
  • Introduction section: I have add the overview picture and tool's abilities, remove the detail information (Metadata, Tags, ...) and re-organize links in the sentences.
  • Description section:
    • I added more information why we need the Metadata and Tags setting in Robot Framework test case.
    • Hints have been removed or re-located properly.
    • Robot Framework test case is used for proper name.
    • Typos are fixed.
    • Change the words to avoid confusion for users. But maybe there is some confused words there :).
    • Regarding to the suggestion for separated section for user who using RobotFramework AIO, I think it is not required (tool can work standalone and TestsuitesManagement just involves in the small part of Metadata settings ) so I keep it as a hint in the sample Robot Framework test case setting section. => Please give your idea about this point
• https://github.com/test-fullautomation/robotframework-robotlog2db/issues/29 => More explanation about the usage of component mapping.

Please review and give your feeling about the updates. Then, I will align it for the document of PyTestLog2DB.

Thank you, Ngoan

[ngoan1608]

Hi Thomas,

The conflict has been solved and document has been updated to latest tool's version.

Thank you, Ngoan