Reordering description of the 'First Script' description

[louisegrimble]

The reordering and re-configuring allows for the learner to follow the script along with the description in a more appropriate, line by line- rather than searching through the description for the description line that matches the section of code. Removed some lines of code that were repeated.

Here is the revised text:

1. An optional interpreter directive (“Shebang”) line, specifying the location of the Nextflow interpreter.
   2.nextflow.enable.dsl=2to enable DSL2 syntax.
2. A multi-line Nextflow comment, written using C style block comments, followed by a single line comment.
3. A pipeline parameter params.input which is given a default value, of the relative path to the location of a compressed fastq file, as a string.
4. An unnamed workflow execution block, which is the default workflow to run.
5. A Nextflow channel used to read in data to the workflow.
6. A call to the process NUM_LINES.
7. An operation on the process output, using the channel operator .view().
8. A Nextflow process block named NUM_LINES, which defines what the process does.
9. An input definition block that assigns the input to the variable read, and declares that it should be interpreted as a file path.
10. An output definition block that uses the Linux/Unix standard output stream stdout from the script block.
11. A script block that contains the bash commands printf '${read}' and gunzip -c ${read} | wc -l.