Improve get-it page

Nibaldo Gonzálezrequested to merge
ngonzalez/kate-editor-org:fix-links into master

get-it page:

  • Corrects broken link of the "distributions" page.
  • Add links of Kate and KWrite at apps.kde.org.
  • Add new Kate download links (Linux):
    • Discover/AppStream
    • Flatpak/Flathub
    • Snap/Snapcraft
    • AppImage.
Edited by Nibaldo González

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