Move dataflow-traces to the taint mode section

[ahpaleus]

Move https://appsec.guide/docs/static-analysis/semgrep/installation/#:~:text=d.%20Data%20flow%20tracing%3A here: https://appsec.guide/docs/static-analysis/semgrep/advanced/#taint-mode

[JanetMo]

Hi, you mean putting the whole section 4.d "Data flow tracing" to the "Taint mode" section on the advances usage page?

[ahpaleus]

Just the description of --dataflow-traces would be ok :)

[JanetMo]

Okay, I tried to add the description of dataflow traces #11 (I didn't remember to open a new branch for the new commit, sorry)
Maybe you can adapt this...