docs: add missing man page for debian release

Cargo.toml

@@ -25,6 +25,7 @@ assets = [
     [ "target/release/eza", "/usr/bin/eza", "0755" ],
     [ "target/release/../man/eza.1", "/usr/share/man/man1/eza.1", "0644" ],
     [ "target/release/../man/eza_colors.5", "/usr/share/man/man5/eza_colors.5", "0644" ],
+    [ "target/release/../man/eza_colors-explanation.5", "/usr/share/man/man5/eza_colors-explanation.5", "0644" ],
     [ "completions/bash/eza", "/usr/share/bash-completion/completions/eza", "0644" ],
     [ "completions/zsh/_eza", "/usr/share/zsh/site-functions/_eza", "0644" ],
     [ "completions/fish/eza.fish", "/usr/share/fish/vendor_completions.d/eza.fish", "0644" ],