Change title prefix

[doublevkay]

Should we change the title [Expert] to [Advance]?

[hdthinh1012]

Should we change the title [Expert] to [Advance]?

Currently we have 3 level of difficulties based on the referenced LGTM queries: [Basic], [Expert], [Advance].
[Basic]: the simple pattern queries
[Expert]: taint-tracking queries extending base class such as TaintTracking::Configuration to extends definition of source, sink, taint paths to identify different sophisticate cases of vulnerabilities
[Advanced]: currently a mix-match of 2 above difficulties having both pattern queries and some basic taint-tracking queries.

I agree that [Advanced] difficulty is ambiguous and should be dicussed further after init queries task is done.