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.

.vscode/markdown.code-snippets

@@ -0,0 +1,39 @@
+{
+"Season 5 Show Notes": {
+		"prefix": ";s5",
+		"body":[
+			"---",
+			"title: ${title}",
+			"date: ${date}",
+			"---",
+			"{% prologue %}",
+			"${newspaperName}",
+			"===",
+			"${newspaperTagline}",
+			"{% timeTag date %}",
+			"\n## ${newspaperHeadline}",
+			"${newspaperSubheadline}\n",
+			"${article}"
+			"{% endprologue%}",
+			"\n{% alternateTitles%}",
+			"\n${alternateTitles}\n",
+			"{% endalternateTitles%}",
+		]
+	},
+	"Season 1 Show Notes": {
+		"prefix": ";s1",
+		"body":[
+			"---",
+			"title: ${title}",
+			"date: ${date}",
+			"---",
+			"# Prologue",
+			"<section class=\"prologue\"><div>",
+			"\n# Episode {{episode}}",
+			"\n## ${headline}",
+			"**${subHeadline}**",
+			"\n${content}\n",
+			"</div></section>"
+		]
+	}
+}