CMake takes a `FALLBACK_CONFIG_DIR` flag which is the directory where the
standard configuration file `config` is copied at installation.
If loading from typical configuration directories fails, sway loads
FALLBACK_CONFIG_DIR/config (/etc/sway/config by default).
Asciidoc uses tildes to subscript and carets to superscript text.
The first tilde can be escaped to fix this, but looks weird because
the second tilde may not be escaped.
It doesn't seem like subscripting will be used in the man page so it
makes sense to disable it altogether.
