Feature Newly Added Transcripts on the homepage to increase discoverability

Currently, there is no functionality on our frontend that allows visitors to easily discover newly added transcripts. By implementing a feature to highlight these transcripts directly on the homepage, we can significantly enhance user engagement and provide visitors with fresh content to explore.

Additionally, considering the importance of accessibility to information, we should explore the possibility of incorporating an RSS feed into our frontend. While Hugo supports RSS feed creation, we have yet to enable it. By introducing an RSS feed, we can offer users another way to stay updated on newly added transcripts and seamlessly integrate our content with their preferred RSS readers.

Notes:
- [TLDR](https://github.com/bitcoinsearch/tldr) already has an RSS feed. Enabling RSS feeds across all our products lays the groundwork for easy aggregation of all published content into a single feed in the future.
- I previously experimented with featuring newly added transcripts, but encountered challenges due to our existing Hugo setup. Primarily, our reliance on the `date` field for each transcript, which corresponds to the date of the original source material publication, complicates sorting by the transcript's actual publish date.

先檢查 Hugo 首頁的設定，以及逐字稿中繼資料目前如何使用 `date` 欄位。定義實際逐字稿發布日期的表示與排序方式，接著確認新加入的逐字稿可以在首頁找到，且 RSS 輸出已啟用並包含這些逐字稿。

由索引模型根據 Issue 內容生成。