Cleanup markdown styling

[aliabid94]

Couple issues wth markdown styling, also lots of repeated css across Chatbot.svelte, MarkdownCode.svelte, and typography.css. I put repeated css in typography.css, removed from other sources. Also fixed:

• nested list indentation didn't work in gr.Markdown
• Text in a list that was longer than a line caused a line break at the start of the line, fixed now.
• chatbot list indentation was too great in gr.Chatbot
• Margin for h1, and for last element not set correctly

BEFORE

AFTER

Demo for above:

import gradio as gr

def welcome(name):
    return f"Welcome to Gradio, {name}!"

with gr.Blocks() as demo:
    md =     """Absolutely, here are 10 tips for maintaining your health from [Harvard Health](https://www.health.harvard.edu/staying-healthy/10-tips-for-better-health):
- Eat a variety of foods including fruits, vegetables, lean proteins, whole grains, and healthy fats. Avoid excessive sugar, salt, and processed foods.
    - nested a
    - nested b
    - lorem ipsum dolor sit amet consectetur adipiscing elit sed do eiusmod tempor incididunt ut labore et dolore magna aliqua

- Aim for at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous activity each week, along with strength training exercises twice a week.

# Table Example
| Header 1 | Header 2 |
|----------|----------|
| Data 1   | Data 2   |
| Data 3   | Data 4   |

- Get at least 7 hours of sleep each night and practice good sleep hygiene.

$$y = mx + b$$

and finally some code:

~~~python
def welcome(name):
    return f"Welcome to Gradio, {name}!"
~~~

    """
    with gr.Row():
        gr.Markdown(md)
        gr.Chatbot([[md, md]], height="100%")

if __name__ == "__main__":
    demo.launch()

[gradio-pr-bot]

🪼 branch checks and previews

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---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/fd2f59d7e3dbc0554a5b75588a4bacaa4e830007/gradio-4.31.3-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@fd2f59d7e3dbc0554a5b75588a4bacaa4e830007#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/chatbot	minor
@gradio/markdown	minor
@gradio/theme	minor
gradio	minor

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Cleanup markdown styling

Maintainers or the PR author can modify the PR title to modify this entry.

Something isn't right?

• Maintainers can change the version label to modify the version bump.
• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[pngwn]

This is awesome. Thanks you @aliabid94!!