This commit changes the Fedora Council charter to use updated language
about the Diversity, Equity, & Inclusion Advisor. In 2017, the role was
changed to "Diversity & Inclusion Team Representative", but in its real
function, this was not how the role was utilized in the Council. For
some time, the DEI Team documentation reflects the role as "DEI Advisor"
while the official Council charter does not reflect this. So, the main
change in this is updating the language to match what the DEI Team
includes as role documentation for the DEI Advisor to the Council.

Additionally, the DEI Advisor is now moved from an auxiliary seat to a
full, voting member of the Fedora Council. This is a step as a whole to
retire the auxiliary seats and give every member of the Council an equal
voice and impact in voting and decisions. In function, this is how the
Council already works, but our charter is not reflective of this and
technically the charter is the ultimate truth.

This follows an in-person conversation with @mattdm, and by opening a
Pull Request for this change, requires a Council vote to update the
charter.