Move emoji task docs to a separate file

lib/mix/tasks/pleroma/emoji.ex

@@ -6,54 +6,6 @@ defmodule Mix.Tasks.Pleroma.Emoji do
   use Mix.Task
 
   @shortdoc "Manages emoji packs"
-  @moduledoc """
-  Manages emoji packs
-
-  ## ls-packs
-
-      mix pleroma.emoji ls-packs [OPTION...]
-
-  Lists the emoji packs and metadata specified in the manifest.
-
-  ### Options
-
-  - `-m, --manifest PATH/URL` - path to a custom manifest, it can
-    either be an URL starting with `http`, in that case the
-    manifest will be fetched from that address, or a local path
-
-  ## get-packs
-
-      mix pleroma.emoji get-packs [OPTION...] PACKS
-
-  Fetches, verifies and installs the specified PACKS from the
-  manifest into the `STATIC-DIR/emoji/PACK-NAME`
-
-  ### Options
-
-  - `-m, --manifest PATH/URL` - same as ls-packs
-
-  ## gen-pack
-
-      mix pleroma.emoji gen-pack PACK-URL
-
-  Creates a new manifest entry and a file list from the specified
-  remote pack file. Currently, only .zip archives are recognized
-  as remote pack files and packs are therefore assumed to be zip
-  archives. This command is intended to run interactively and will
-  first ask you some basic questions about the pack, then download
-  the remote file and generate an SHA256 checksum for it, then
-  generate an emoji file list for you.
-
-  The manifest entry will either be written to a newly created
-  `index.json` file or appended to the existing one, *replacing*
-  the old pack with the same name if it was in the file previously.
-
-  The file list will be written to the file specified previously,
-  *replacing* that file. You _should_ check that the file list doesn't
-  contain anything you don't need in the pack, that is, anything that is
-  not an emoji (the whole pack is downloaded, but only emoji files
-  are extracted).
-  """
 
   def run(["ls-packs" | args]) do
     Application.ensure_all_started(:hackney)