hostname-wordlist: replace "petnames" wordlists

The petnames wordlist added in [1] is Apache-2.0 and this
causes problems with the distribution of systemd as the
GPL-2 and Apache-2.0 are considered incompatible by the FSF.

So this commit replaces the previous wordlist with
a new one:
- weather (basic english weather adjectives)
- colors (basic english color names)
- worlds (planets, moons, minor bodies of the solar system)

All common vocabulary and compiled for this project, not taken
from anywhere.

An example with the new list:
- wintry-rust-dione-9393
- warm-yellow-saturn-39f9

The "worlds" are picked on the following principles:
- well-known
- memorable
- short(ish)
- cool

This is why e.g. we have "thetis" (an astroid) instead of
"tethys" (a moon): easier to spell and more well known.

[1] https://github.com/systemd/systemd/pull/42566

man/hostname.xml

@@ -58,7 +58,7 @@
     cryptographic hashing. Each <literal>$</literal> is positional: the first <literal>$</literal> uses the word
     list file named <filename>1</filename>, the second <filename>2</filename>, and so on. This allows
     human-friendly names, for example <literal>$-$-$-????</literal> might expand to
-    <literal>wildly-happy-octopus-92a9</literal>. The word lists are searched for in
+    <literal>sunny-red-europa-92a9</literal>. The word lists are searched for in
     <filename>/etc/systemd/hostname-wordlist/</filename>, <filename>/run/systemd/hostname-wordlist/</filename>,
     <filename>/usr/local/lib/systemd/hostname-wordlist/</filename> and
     <filename>/usr/lib/systemd/hostname-wordlist/</filename> (the first directory providing a given list wins,