Farsi/Persian podcast (#6076)

* new section and farsi/persian podcast added

* change in sections

* remove index section

* fix title

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

* fix: linter faults `unordered-list-marker-style`

casts/free-podcasts-screencasts-fa_IR.md
  3:1-3:28  warning  Marker style should be `*`  unordered-list-marker-style  remark-lint

Co-authored-by: Eric Hellman <eric@hellman.net>
Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

casts/free-podcasts-screencasts-fa_IR.md

@@ -9,3 +9,4 @@
 * [رادیو گیک](https://soundcloud.com/jadijadi) (podcast)
 * [رادیو گیک](https://anchor.fm/radiojadi) - Jadi (podcast)
 * [رادیو گیک](https://www.youtube.com/playlist?list=PL-tKrPVkKKE1peHomci9EH7BmafxdXKGn) (videocast)
+* [Radio Developer - رادیو دولوپر](https://castbox.fm/channel/id4407294) (podcast)