Update the code block in tutorial post event-driven-programming from
passing by pointer to passing by reference.

Jira: https://gem5.atlassian.net/browse/GEM5-1331
Change-Id: I409d8b04d4a79c22b08905f68fdef10c8243dd86
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/72198
Maintainer: Jason Lowe-Power <[email protected]>
Tested-by: Jason Lowe-Power <[email protected]>
Reviewed-by: Jason Lowe-Power <[email protected]>

Change-Id: I09538650e01550f09c41f39bbad5e4750700b220
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/72230
Tested-by: Bobby Bruce <[email protected]>
Maintainer: Bobby Bruce <[email protected]>
Reviewed-by: Bobby Bruce <[email protected]>

* website: Fix ISCA 2023 poster links

Made the links point to the correct filename.

* website: Update poster author information

* website: Update github documentation

This updates any links and mentions of googlesource or Gerrit,
and updates the review process for moving to GitHub

Change-Id: I0e038f979a55d915befdbb3e8cb5d4edcb5e32dc

* Fix README.md to include Jason GitHub ID

Co-authored-by: Jason Lowe-Power <[email protected]>

* Fix README.md to include Bobby GitHub ID

Co-authored-by: Jason Lowe-Power <[email protected]>

* website: Remvove 'submit' call from README/md

---------

Co-authored-by: Melissa Jost <[email protected]>
Co-authored-by: Jason Lowe-Power <[email protected]>

* website: Enable 'www.gem5.org/join-slack' URL

https://www.gem5.org/join-slack will re-direct to an invitation to join
the slack channel.

This is an easier link to pass around to the gem5 community.

* website: Update "Join our Slack" to use gem5.org URL

This means we only need to update one page if this invite link changes.

* website: Update the contributing.md for GitHub

* website: Fix incorrect squash-and-merge link

Co-authored-by: Jason Lowe-Power <[email protected]>

* website: Move and expand 'Keeping your forked repo..."

This expands how to keep your forked and local repository up-to-date
(i.e., in-synic with the main gem5 repository).

It also moves it to it's own section.

* website: Fix 'stable' -> 'develop' typo

* website: 'recommend' -> 'strongly recommend' for local branches

* website: Minor changes to contributing.md

---------

Co-authored-by: Jason Lowe-Power <[email protected]>

This allows us to link to a more detailed explanation of
using change-ids when someone's test fails.

Without adding the main gem5 repository as a remote, the command for
syncing a fork and local repository to the main gem5 repository
does not work. `upstream` needs set. This patch fixes this error.