Fix errors during ubuntu install

Encountering the python header error on a fresh ubuntu install:

```  utils_find_1st/find_1st.cpp:3:10: fatal error: Python.h: No such file or directory
   #include "Python.h"
            ^~~~~~~~~~
  compilation terminated.
```

solved by installing python3.7-dev. Also need to ensure python3.7-venv for fresh install.

docs/installation.md

@@ -60,7 +60,7 @@ OS Specific steps are listed first, the [Common](#common) section below is neces
     sudo apt-get update
 
     # install packages
-    sudo apt install -y python3-pip python3-venv python3-pandas git
+    sudo apt install -y python3-pip python3.7-venv python3.7-dev python3-pandas git
     ```
 
 === "RaspberryPi/Raspbian"