Install theme files accumulatively from zip file

[areguera]

Here are some screenshots showing the expected presentation:

category.php	footer.php

single.php	search.php

Configuration takes places in default/main.yml:

# ===============================================================================
# Blog theme configuration.
#
# Themes are being installed in accumulative way to avoid conflicts between
# different theme versions (e.g., because files were added or removed). You can
# switch from one theme version to another using the wordpress graphical user
# interface, after performing a live preview verification. As new themes are
# installed, older themes are available as backup mechanism.
#
# New theme releases can be found in:
# - https://gitlab.com/CentOS/artwork/centos-web/wordpress-theme-centos/-/releases
# ===============================================================================
wp_theme_name: wordpress-theme-centos
wp_theme_version: "1.0.16"

Some changes compared with previous version include the following:

1. Update CentOS logo.

2. Add a section to present the latest YouTube video uploaded to TheCentOSProject channel. Because of the URL used, it shouldn't be necessary to change the theme in order to show the next video uploaded.

3. Link to blog pages on the navbar. Previously, blog pages were not properly presented. Now, links to blog pages are always visible on the navigation bar. To access CentOS website links, it is necessary to go to CentOS website clicking on the Home link presented in the breadcrumbs section.

4. The breadcrumbs section continues being the main place to identify the hierarchy of CentOS websites.

5. Update artistic motif used on navigation bar, headers, and footer to be consistent with artistic motif designed for CentOS Stream 10 lifetime.