Move pages under tldr, lint run.sh, update docs

tldr/id3tag

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# id3tag
+
+> Read, write, and manipulate ID3v1 and ID3v2 tags of MP3 files.
+> More information: <https://manned.org/id3tag>.
+
+- Set artist and song title tag of an MP3 file:
+
+`id3tag --artist {{artist}} --song {{song_title}} {{path/to/file.mp3}}`
+
+- Set album title of all MP3 files in the current directory:
+
+`id3tag --album={{album}} {{*.mp3}}`
+
+- Display help:
+
+`id3tag --help`