Refactored documentation for Docker hub workflow

- Readme size lowered to 18KB
- Documents created in doc/ directory
- faq.md, firewall.md, development.md
- Title svg as absolute path for Docker hub
- Re-enabled Docker hub description workflow

doc/development.md

@@ -0,0 +1,43 @@
+# Development
+
+## Setup
+
+### Using VSCode and Docker
+
+That should be easier and better than a local setup, although it might use more memory if you're not on Linux.
+
+1. Install [Docker](https://docs.docker.com/install/)
+    - On Windows, share a drive with Docker Desktop and have the project on that partition
+    - On OSX, share your project directory with Docker Desktop
+1. With [Visual Studio Code](https://code.visualstudio.com/download), install the [remote containers extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)
+1. In Visual Studio Code, press on `F1` and select `Remote-Containers: Open Folder in Container...`
+1. Your dev environment is ready to go!... and it's running in a container :+1:
+
+### Locally
+
+Install [Go](https://golang.org/dl/), [Docker](https://www.docker.com/products/docker-desktop) and [Git](https://git-scm.com/downloads); then:
+
+```sh
+go mod download
+```
+
+And finally install [golangci-lint](https://github.com/golangci/golangci-lint#install)
+
+## Commands available
+
+```sh
+# Build the entrypoint binary
+go build cmd/main.go
+# Test the entrypoint code
+go test ./...
+# Lint the code
+golangci-lint run
+# Build the Docker image
+docker build -t qmcgaw/private-internet-access .
+```
+
+## Guidelines
+
+The Go code is in the Go file [cmd/main.go](../cmd/main.go) and the [internal directory](../internal), you might want to start reading the main.go file.
+
+See the [Contributing document](.github/CONTRIBUTING.md) for more information on how to contribute to this repository.