Support for /sys/class/power_supply/ and minor improvements

Thanks to PR's and some thoughtful issues from @Agent-11 I've cut a new release with some improvements.

Support for /sys/class/power_supply/ on linux systems including WSL. Please try it out and leave feedback.
Improvements to the powershell support
Battery info method is now stored and used in the health check

Nerd font updates

Check the README for details. This release fixes some deprecated icons used in the plugin. If you encounter missing icons after upgrading please check that your font is using Nerd Font version 2.3 or 3.0.

Maintenance update and multiple battery support

This release I have updated the README to reflect that the web-dev-icons plugin, that battery.nvim is dependent on, has moved.
In addition wanted to call out that there is now support for picking a particular battery. This is currently for linux only. Check the README for details.

Support linux/acpi

Due to popular request linux is now supported. It requires acpi which you can install via your package manager.

Remove example images from plugin repo and add horinzontal icon support

Implements horizontal icon option.
Removes example image data so plugin users don't have to download it.
See https://www.reddit.com/r/neovim/comments/wsg5yx/attention_to_all_plugin_authors_newcomers_careful/

First alpha release

First release I will share publicly.