Reason
This extension's MediaWiki.org page was marked as archived by @Kghbln last month. According to its pre-archival version, the extension explicitly supports MediaWiki 1.5.x+, so it is drastically out-of-date. WikiApiary.org doesn't even have a page for the extension, so it is presumably not installed on any known wikis. Looking through the documentation and the linked code, this isn't even an extension, but a template written to work with a particular (ancient) version of DPL, with additional dependencies.

To-do list

• This task
  • Add maintainers of that extension/skin as subscribers to this task (if they have no apparent Phabricator account, notify them on-wiki or via email if possible and note it here). Maintainer doesn't appear to have edited since 2011.
  • Add Phabricator project <#ProjectX> as a tag for this task, or MediaWiki-extensions-Other if there is no project.
• On-wiki documentation
  • Archive documentation on mediawiki.org (https://www.mediawiki.org/wiki/Extension:DPL_Page_Name_S/N_Maker): replace page contents with {{TNT|Archived extension|last revision id before archiving|reason=archive reasons, per [[phab:T######]]}}; include a link to this task in the reason parameter.
  • If documentation page was translatable, remove <translate>, visit Special:PageTranslation, and click "remove from translation" (if you don't have the translation administrator right, ask a user who does).
  • Archive Wikidata item associated with documentation page (provide URL) (remove nearly all statements, except instance of (P31) = MediaWiki extension (Q6805426), which should add a qualifier end time (P582) = the YYYY-MM-DD date that you decided to archive extension, generally per edit history, change English (and other languages if possible) description to "archived MediaWiki extension" (and its translation)).
• Phabricator
  • Archive Phabricator project <#ProjectX> for the extension.
  • Mark all Phabricator tasks for the extension either Declined or Invalid.
  • Edit Phabricator project <#ProjectX> description for the extension with a link to this ticket.
• Translatewiki.net/translations
  • Remove from translatewiki.net (groups/MediaWiki/mediawiki-extensions.txt) (add translatewiki.net project as a tag for this task).
• Configuration/tests/integrations/etc.
  • Remove from mediawiki/extensions (along with in .gitmodules).
  • Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | integration/config ]] (zuul/layout.yaml).
  • Remove manifest/other references from mediawiki/vagrant if they exist.
  • Remove from https://doc.wikimedia.org/cover-extensions/ if present (requires Continuous-Integration-Infrastructure shell user to delete directly from the server).
• Repositories
  • Empty repository and add an ARCHIVED file.
  • Archive the diffusion repository for the extension: (provide the Diffusion repository callsign or URL).
  • Mark the repository read-only in Gerrit: (provide Gerrit Repository URL).
  • Delete the GitHub mirror: (provide GitHub repository URL).