"Unstarted Projects" and "Completed Projects" should be visibly disctinct from current ones

Unsure if this is a new status of the existing "Project" content-type, or if it's a different thing where "completed projects" become "Case Studies". I'm leaning toward the first, but am open to the latter (I do think it would provide additional marketing value to better-customize pages based on content goals)

未指定檔案、範本或測試。首先檢視目前的 Jekyll 網站如何呈現 Project 內容與頁面，接著確認所要求的區分是使用專案狀態，還是使用獨立的 Case Studies 類型。完成的條件是已就內容模型達成共識，並且對尚未開始、目前進行中與已完成的工作採取明顯不同的處理方式。

由索引模型根據 Issue 內容生成。