Provide an alternative Lua version

[alexaandru]

With 7898dac commit, the repo switched from Lua to Fennel.

If you would still want a Lua version, please vote on this issue. Based on the feedback, I may continue to also provide an alternative for those that do now want to install Fennel (that is, https://github.com/rktjmp/hotpot.nvim).

So please vote: 👍 (that's a vote for Lua) or 💯 (that means, you like it the way it is, Fennel only).

Thank you!