Reduce size of freeze build and added more documentation

setup/BUILD.md

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+# Build and Install novelWriter
+
+The root folder of the repository contains two scripts for setup and install:
+
+## Script `setup.py`
+
+The `setup.py` is a standard Python setup script with a couple of additional options:
+
+* `qthelp`: Will attempt to build a single file QtAssistand documentation file.
+  This requires the Qt tools to be installed on the local system, as well as the sphinx build tools
+  for the documentation.
+* `sample`: Will create a `sample.zip` file in the `nw/assets` folder.
+   This is the file the New Project Wizard uses to generate an example project.
+   If novelWriter is run from source, this file is not needed.
+
+To install novelWriter as a local Python package, run:
+```bash
+sudo python setup.py install
+```
+
+## Script `make.py`
+
+The `make.py` script provides a number of convenient options for building packages if novelWriter.
+
+Usage:
+```bash
+python make.py [command]
+```
+
+It currently accept the following commands:
+
+* `help`: Print the help message.
+* `freeze`: Freeze the package and produces a folder of all dependencies using pyinstaller.
+* `onefile`: Build a standalone executable with all dependencies bundled.
+   Implies `freeze`, cannot be used with `setup`.
+* `pip`: Run pip to install all package dependencies for novelWriter and this build tool.
+* `setup`: Build a setup.exe installer for Windows.
+   This option automaticall disables the `onefile` option.
+* `clean`: This will attempt to delete the `build` and `dist` folders in the current folder.
+
+For instance, to create a Windows installer, run:
+```bash
+python make.py freeze setup
+```