Update images in docs/plugins/plugin_resources.rst in branch 5.2

[RCheesley]

Description

The user interface in docs/plugins/plugin_resources.rst has changed, and the images in this documentation need to be updated to reflect the new UI.

Website page

https://docs.mautic.org/en/7.0/plugins/plugin_resources.html

Suggestions

The following images are referenced and need to be reviewed and updated as needed:

• docs/plugins/images/plugins.png
• docs/plugins/images/install-plugins.png
• docs/plugins/images/push-integration.png

Important notes

• Please follow the instructions on the website page to navigate Mautic.
• Please use the light mode to take the screenshots.
• Please zoom out bit by bit until you can capture the whole component if the component occupied the screen or need to be scrolled.
• Please use red color if you need to highlight (create a box for) the components.
• Please save the images in .png.
• Always test and preview your changes locally to ensure that the images are rendered properly.