User:GTrang/To do

* ✅ Add 2022 to the "Historical years" cateory and update its description.
 * ✅ Remove 2023 from the "Future years" category and update its description.
 * ✅ Update the bold link in the "Years in century" template to refer to 2023 instead of 2022.
 * ✅ Update holiday pages and the corresponding monthly calendar templates to refer to 2023 instead of 2022.
 * ✅ Show the previous and next occurrences of each dominical letter on the Common year and Leap year pages.
 * ✅ Create a history page at Holidays:History listing major milestones in the history of the wiki.
 * Extend the future year pages on this wiki by another 6000 years to the year 10000.
 * ✅ Create century pages and categories for centuries from the 41st century to the 100th century.
 * ✅ Create non-Easter-related holiday templates to cover 6 more millennia.
 * ✅ Update the non-Easter-related holiday pages to include 6 more millennia.
 * ✅ Create pages for the years 4001 to 4099.
 * Complete the subtasks in the table below.
 * Create a page for the year 10000.