Add videos to docs

[iddoavn]

Closes #7792

Change Description

Added links to YouTube where relevant for some videos to help understand lakeFS.

Background

Share context and relevant information for the PR: offline discussions, considerations, design decisions etc.

Since I'm not sure how easy it will be to track the videos (although I assume it will be simple with the YouTube admin) I've added a doc containing the current views of the videos today - so we can compare down the line.

New Feature

We have a lot of videos out there already describing usage and integration of lakeFS. Some individuals prefer to consume videos as they learn software. Would be good to sprinkle those into the docs where relevant.