Add pragtical

[dsyme]

Fixes #566

Add a new entry for Pragtical in the concepts directory.

• New file concepts/pragtical.scroll
  • Import conceptPage.scroll
  • Set id to pragtical
  • Set name to Pragtical
  • Set website to https://pragtical.dev/
  • Add a brief description of Pragtical
  • Add tags textEditor
  • Specify writtenIn as lua and c
  • List features including syntax highlighting, multiple cursors, command palette, LSP support, and plugin support
  • Mention cross-platform support for Windows, Linux, and macOS
  • Specify license as MIT

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