Revert "Mamba -f does not like URLs"

This reverts commit b7094c3.

Issue mamba-org/mamba#3867 is solved.

Author: rkdarst

content/conda.md

@@ -137,8 +137,7 @@ We will call the environment `coderefinery`.
   Then type
   (without the `$`):
   ```console
-  $ curl "https://raw.githubusercontent.com/coderefinery/software/main/environment.yml" -o environment.yml 
-  $ mamba env create -n coderefinery -f environment.yml
+  $ mamba env create -n coderefinery -f https://raw.githubusercontent.com/coderefinery/software/main/environment.yml
   ```
   :::
 
@@ -157,10 +156,9 @@ We will call the environment `coderefinery`.
   automatically initialize conda?", but then it will always be
   active).
 
-  In the second step, we will install the software environment by first copying the definition file:
+  In the second step, we will install the software environment:
   ```console
-  $ curl "https://raw.githubusercontent.com/coderefinery/software/main/environment.yml" -o environment.yml 
-  $ mamba env create -n coderefinery -f environment.yml
+  $ mamba env create -n coderefinery -f https://raw.githubusercontent.com/coderefinery/software/main/environment.yml
   ```
   :::
 ::::