Compress images with pngquant

What does this MR do?

As part of the monthly chore list for the technical writing team, I found the following uncompressed images:

[amyq] ~/dev/gitlab/gitlab (master) $ bundle exec rake pngquant:lint
Checking 1206 PNG files in doc/**
Uncompressed file detected: doc/development/img/each_batch_users_table_filtered_index_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_good_index_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_iteration_1_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_iteration_4_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_bad_index_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_iteration_2_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_iteration_5_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_iteration_3_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_v13_7.png
Uncompressed file detected: doc/development/img/each_batch_users_table_filter_v13_7.png
Uncompressed file detected: doc/development/integrations/img/copy_cookies.png
Uncompressed file detected: doc/development/integrations/img/copy_curl.png
Uncompressed file detected: doc/user/project/integrations/img/microsoft_teams_select_incoming_webhook.png
The 13 image(s) above have not been optimally compressed using pngquant.
Please run "bin/rake pngquant:compress" and commit the result.

This merge request compresses those images to save space.

Related issues

Related to technical-writing#307 (closed)

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