First release of nf-core/detaxizer!

This is the initial version of the pipeline:

1. Read QC (FastQC)
2. Pre-processing (fastp)
3. Classification of reads (Kraken2)
4. Optional validation of searched taxon/taxa (blastn)
5. Optional filtering of the searched taxon/taxa from the reads (either from the raw files or the preprocessed reads, using either the output from kraken2 or blastn)
6. Summary of the processes (how many reads were initially present after preprocessing, how many were classified as the tax2filter plus potential taxonomic subtree and optionally how many were validated)
7. Present QC for raw reads (MultiQC)