Improve script to prepare for flatpak release

prepare-flatpak.sh

@@ -1,12 +1,20 @@
 # Usage ./build-flatpak.sh
 
-# First run `cargo vendor` and add the output to ~/.cargo/config.toml
+# download and save the vendored crates
+mkdir .cargo
+cargo vendor >> .cargo/config.toml
+
+# get the current version for the file name
 VERSION=$(cargo metadata --format-version 1  | jq -r '.packages[]  | select(.name | test("lemoa")) | .version')
 
 rm -rf target _build build builddir
 cd ..
+
+# archive the source code and vendored crates to a tar.xz
 tar cfJ "lemoa-$VERSION.tar.xz" lemoa
-sha256sum "lemoa-$VERSION.tar.xz"
+sha256sum "lemoa-$VERSION.tar.xz" | cut -d ' ' -f 1
+
+# cleanup
 cd lemoa
 git reset --hard &> /dev/null
 rm -rf vendor .cargo