Update links to point to the new website, remove duplicate content from README, add building instructions

BUILD.md

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+# 👷 Building EcoDash
+
+Here's how to build EcoDash in both binaries and as a Docker container. This is not necessary for most cases - we provide both pre-built binaries and containers for Linux ARM and x86_64 - however in devices with unsupported architectures it's necessary.
+
+You're encouraged to first check the installation instructions to see if a pre-built container or binary is already available.  
+If you really have to build it yourself, we recommend you Docker over binaries.
+
+## Binaries
+
+### Linux
+
+1. Download the Go Compiler from https://go.dev/dl/ or from your repository's package manager (it's usually called `go` or `golang`)
+2. Download the Git SCM from https://git-scm.com/download/linux or from your package manager (it's always called `git`)
+3. Clone the repository by running `git clone https://gitea.massivebox.net/ecodash/ecodash.git ` inside a command prompt
+4. Switch to the project directory with `cd ecodash`
+5. Download the dependencies with `go get ecodash`
+6. Build with `go build`. This will generate an executable, `ecodash`, in the same directory.
+
+### Windows
+
+1. Install the latest release of the Go Compiler for Windows from https://go.dev/dl/
+2. Install the Git SCM from https://git-scm.com/download/win. The "Standalone installer" is recommended. All the default settings will work fine.
+3. Clone the repository by running `git clone https://gitea.massivebox.net/ecodash/ecodash.git ` inside a command prompt
+4. Switch to the project directory with `cd ecodash`
+5. Download the dependencies with `go get ecodash`
+6. Build with `go build`. This will generate an executable, `ecodash.exe`, in the same directory.
+
+## Docker