Added /blog/edit, inline documentation

site/src/config.rs

@@ -1,5 +1,8 @@
 use std::string::String;
 
+/// gets a value from an environment variable and returns it.
+/// if this call was mandatory and it couldn't get a value, it will exit
+/// the program and write an error message.
 pub fn get_from_env(variable: &str, mandatory: bool) -> String {
     std::env::var(variable).unwrap_or_else(|_| {
         if mandatory {