Added navigation order, split building block to its own page

docs/index.markdown

@@ -1,5 +1,6 @@
 ---
 layout: home
+nav_order: 0
 ---
 
 # cmkr
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 cmkr, pronounced "cmaker", is A CMakeLists.txt generator from TOML.
 
 See the [cmkr topic](https://github.com/topics/cmkr) for examples. Feel free to add the `cmkr` topic to your projects if you used cmkr!
-
-## Building
-
-cmkr requires a C++11 compiler, cmake >= 3.15.
-
-```
-git clone https://github.com/build-cpp/cmkr
-cd cmkr
-cmake -Bbin
-cmake --build bin --parallel
-```