Upgrade runtimes to latest versions:
* elixir from 1.15.4 to 1.15.6
* erlang from 26.0.2 to 26.1.1
Co-authored-by: Joao P Dubas <joao.dubas@gmail.com>
Reviewed-on: #4
To make this effective, the following changes were made:
1. Patch `init.lua` to change common configurations
2. Implement custom configuration for plugins