refactor: move lua docs to the top of LDoc index sidebar.
refactor: move lua docs to the top of LDoc index sidebar.

* build-aux/config.ld.in (files): Move Lua files to the top of
the list.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

zevv/luaposix,snegovick/luaposix,ardje/luaposix,zevv/luaposix,luaposix/luaposix,jimmyharris/luaposix,rrthomas/luaposix,snegovick/luaposix,jimmyharris/luaposix,ardje/luaposix,rrthomas/luaposix