Rename "Stripping" section to "Host Removal"

While many languages like Python have `str.strip`, `str.rstrip`, `str.lstrip`, it's not always clear to non-computer aficionados what it means. I think the flags make sense in context of their usage text, but I feel "Host Removal" is more clear to a new user. Happy to discuss!

Author: olgabot

nextflow_schema.json

@@ -519,8 +519,8 @@
             },
             "fa_icon": "fas fa-layer-group"
         },
-        "stripping": {
-            "title": "Stripping",
+        "host_removal": {
+            "title": "Host Removal",
             "type": "object",
             "description": "Options for production of host-read removed FASTQ files for privacy reasons.",
             "default": "",