Update README.md

[chevybowtie]

Add Alpine and Nginx quick setup

Description

This is just a README update on how to quickly setup Homer on Alpine Linux using Nginx. This is perfect for running Homer in a tiny Linux Container (LXC)

Type of change

• Documentation only

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

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[bastienwirtz]

Hello @chevybowtie

Thanks for the documentation! However, there is a lot of way to install homer and there is already a lot of information in the readme. I want to keep it short and easy to read. The main idea (how to use the prebuild zip release) is already in it, I think it's the most important.
I prefer not merging it, but your doc will still show up if someone search for this specific setup.