Update docs for local setup

[dommyrock]

Update docs for local setup

Testing flow for /data pre populater or completely empty .
Both flows are supported and should work even i you completely delete the /data folder contents.
In that case empty /data is bound into kepler container volume where we re-download all .gz files (in a linear way) and re-extract .json cve representations which are Deserialized and than Imported in the Kepler DB.

Question:
Since we will be replacing kepler in the future , does it make sense to remove /data folder contents now or leave it be? cc @paolo9921

I have

• [x ] run cargo fmt;
• [ x] run cargo clippy;
• [x ] run cargo testand all tests pass;
• [ x] linked to the originating issue (if applicable).

[paolo9921]

I think it’s fine to keep the /data folder for now, no urgency to remove it.

[aleksanderkrauze]

💪