[FEATURE] Add a video of the usage in the main page of the documentation

[valerybriz]

Right now in the main page of the documentation there's only text describing what is dblab used for, then in the quickstart you can find some videos of the usage but the resolution is not good enough to understand it clearly.

Solution:
The idea is to have 1 short video in the main page with good resolution and with a good example of the features of dblab.
And then updating the videos that are currently in the quick start with new videos with better resolution.

Maybe it would be nice to have this "zoom" effects on the different panels on the video in order to make it easier to read and understand.