Add home.php & front-page.php to the theme-specific files list ($wp_file_descriptions)

[ramiy]

When browsing the theme files from the Appearance > Editor screen (wp-admin/theme-editor.php), you see the theme files on the right side.

Two files in the list are missing description - home.php & front-page.php.

The attached patch adds file description to those files by updating the $wp_file_descriptions variable that lists all theme-specific files.

[ramiy]

Found 3 more missing files - taxonomy.php, singular.php and date.php.

[SergeyBiryukov]

In 36087:

Theme Editor: Add taxonomy.php, home.php, front-page.php, date.php, and singular.php to file descriptions.

Props ramiy.
See #35223.

[Asajoarder]

my veryfide

[SergeyBiryukov]

In 36088:

Theme Editor: Break $wp_file_descriptions array into sections and reorder for consistency and readability.

Props ramiy.
Fixes #35223.