DOC: Make `make conan` more prominent.

For issue #37

doc/README_SETUP.md

-# How to Develop and Use Libcaosdb
+# How to use and develop libcaosdb
 
 ## Dependencies
 
@@ -6,6 +6,17 @@
 
 ## Build
 
+### Building with `make` ##
+
+Make sure that the dependencies (see above) are fulfilled.  On systems which have `make` installed,
+type this in your command line terminal:
+
+```console
+make conan
+```
+
+### Manual build ##
+
 We use [cmake](https://cmake.org) as build tool, with Conan as package manager.
 The compiler must support the C++17 standard.
 
@@ -66,12 +77,6 @@ as compiler. We use [cmake](https://cmake.org/download/) as build tool.
   fix this in the next release. See
   [#34](https://gitlab.indiscale.com/caosdb/src/caosdb-cpplib/-/issues/34)
 
-### Creating a local Conan package ##
-
-Building and installing libcaosdb with Conan is just a single command: `make conan`
-
-For MacOS, you probably should adjust the option as mentioned above.
-
 ### Troubleshooting
 
 #### `conan install` fails due to missing prebuilts