fix installing from source tarball

docs/devnotes.md

@@ -17,6 +17,7 @@
 * [building](#building)
     * [dev env setup](#dev-env-setup)
     * [just the sfx](#just-the-sfx)
+    * [build from release tarball](#build-from-release-tarball) - uses the included prebuilt webdeps
     * [complete release](#complete-release)
 * [todo](#todo) - roughly sorted by priority
     * [discarded ideas](#discarded-ideas)
@@ -255,10 +256,31 @@ then build the sfx using any of the following examples:
 ```
 
 
+## build from release tarball
+
+uses the included prebuilt webdeps
+
+if you downloaded a [release](https://github.com/9001/copyparty/releases) source tarball from github (for example [copyparty-1.6.15.tar.gz](https://github.com/9001/copyparty/releases/download/v1.6.15/copyparty-1.6.15.tar.gz) so not the autogenerated one) you can build it like so,
+
+```bash
+python3 setup.py install --user
+```
+
+or if you're packaging it for a linux distro (nice), maybe something like
+
+```bash
+bash scripts/run-tests.sh python3  # optional
+python3 setup.py build
+python3 setup.py install --skip-build --prefix=/usr --root=$HOME/pe/copyparty
+```
+
+
 ## complete release
 
 also builds the sfx so skip the sfx section above
 
+does everything completely from scratch, straight from your local repo
+
 in the `scripts` folder:
 
 * run `make -C deps-docker` to build all dependencies