Cleanup - prep for new plugin

[aristath]

Context

Preliminary work for the new plugin which will be released with a comment-hacks slug

• Remove references and links to Yoast
• Rename the plugin from yoast-comment-hacks to comment-hacks
• Change repo URLs to point to the new URL under the Emilia-Capital umbrella
• Replace the yoast_ and yoast- prefixes with emiliaprojects_ and emiliaprojects-
• Remove deprecated code. Since this will be a new plugin, deprecated code should not be kept
• Change the textdomain from yoast-comment-hacks to comment-hacks
• Rename global JS functions to use the emiliaProjects prefix instead of yoast
• Remove global variables containing the yoast prefix
• Clean-up the changelog.

Test instructions

Test that the main plugin functionality and admin UIs still works as expected. A lot of stuff was renamed, classes, IDs etc, so we should make sure things are still in the right place.
NOTE: Since the main plugin file was renamed, if the previous version is activated, it should be deactivated prior to pulling this PR. This should not be treated as an update, but as a new plugin.

Relevant test scenarios

• Changes should be tested with the browser console open
• Changes should be tested on different posts/pages/taxonomies/custom post types/custom taxonomies
• Changes should be tested on different editors (Block/Classic/Elementor/other)
• Changes should be tested on different browsers
• Changes should be tested on multisite

UI changes

• This PR changes the UI in the plugin. I have added the 'UI change' label to this PR.
  NOTE: The UI itself didn't change, however the HTML of the UI did.

Documentation

• I have written documentation for this change.

Quality assurance

• I have tested this code to the best of my abilities.
• I have added unit tests to verify the code works as intended.
• I have checked that the base branch is correctly set.

Fixes #

[jdevalk]

Looks good! I just think we can make it even easier on ourselves. We should probably also just update the namespace to something simpler, although there may be reasons to include the company name?