feat: improve Markdown support and add transcript search functionality

- Add `.cache` to `.gitignore` for temporary build files.
- Introduce Markdown snippets for creating Season 1 and Season 5 show notes in `.vscode/markdown.code-snippets`.
- Update `.vscode/settings.json`:
  - Exclude `node_modules` directory.
  - Adjust quick suggestions to disable them for comments, strings, and others.
- Remove unnecessary `console.log` statements from `episodes.11tydata.js`.
- Add an image file `content/episodes/image.jpg`.
- Implement a transcript search feature:
  - Add `search-transcripts.hbs` to enable searching transcript cues with time markers.
  - Add `transcript-index.11ty.js` to generate a searchable transcript index.
- Update `search-index.11ty.js` to skip processing `<hr>` and `<img>` tags.
- Enhance episode layout with `startAt` query parameter to allow audio playback from a specific time.
- Add a new dependency:
  - `@11ty/eleventy-fetch` for fetching transcripts.
  - `media-captions` for parsing and handling transcript files.
- Update package-lock.json and package.json to include new dependencies.

package.json

@@ -12,6 +12,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "@11ty/eleventy-fetch": "^5.0.1",
     "@11ty/eleventy-navigation": "^0.3.5",
     "@11ty/eleventy-plugin-handlebars": "^1.0.0",
     "@11ty/eleventy-plugin-rss": "^2.0.2",
@@ -25,6 +26,7 @@
     "htmlparser2": "^9.1.0",
     "luxon": "^3.5.0",
     "markdown-it": "^14.1.0",
+    "media-captions": "^0.0.18",
     "music-metadata": "^10.5.1",
     "npx": "^10.2.2",
     "podcast": "^2.0.1",