Source NFO downloads (#95)

* Hooked up series directory finding to source metadata runner

* Fixed aired NFO tag for episodes

* Updated MI NFO builder to take in a filepath

* Hooked up NFO generation to the source worker

* Added NFO controls to form

* Improved the way the source metadata worker updates the source

* Consolidated NFO selection options in media profile instead of source

lib/pinchflat_web/controllers/sources/source_html/source_form.html.heex

@@ -41,7 +41,7 @@
     <.input
       field={f[:fast_index]}
       type="toggle"
-      label="Use Fast Indexing?"
+      label="Use Fast Indexing"
       label_suffix="(pro)"
       help="Experimental. Ignores 'Index Frequency'. Recommended for large channels that upload frequently. See below for more info"
     />
@@ -54,7 +54,7 @@
   <.input
     field={f[:download_media]}
     type="toggle"
-    label="Download Media?"
+    label="Download Media"
     help="Unchecking still indexes media but it won't be downloaded until you enable this option"
   />