4 themes do not exist in `themes/README.md`

**Describe the bug**

Previews for the four themes `ocean_dark`, `city_lights`, `github_dark` and `discord_old_blurple` do not exist in `themes/README.md`.

https://github.com/anuraghazra/github-readme-stats/blob/7907a5d33892bdfd4af707fd670f9b364bc8e17f/themes/index.js#L273-L296

**Expected behavior**

There are previews of the four themes in README.md.

**Additional context**

Is the automatic update mechanism stopped?
https://github.com/anuraghazra/github-readme-stats/pull/890

	ocean_dark: {
	title_color: "8957B2",
	icon_color: "FFFFFF",
	text_color: "92D534",
	bg_color: "151A28",
	},
	city_lights: {
	title_color: "5D8CB3",
	icon_color: "4798FF",
	text_color: "718CA1",
	bg_color: "1D252C",
	},
	github_dark: {
	title_color: "58A6FF",
	icon_color: "1F6FEB",
	text_color: "C3D1D9",
	bg_color: "0D1117",
	},
	discord_old_blurple: {
	title_color: "7289DA",
	icon_color: "7289DA",
	text_color: "FFFFFF",
	bg_color: "2C2F33",
	},

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4 themes do not exist in `themes/README.md` #1254

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4 themes do not exist in themes/README.md #1254

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4 themes do not exist in `themes/README.md` #1254