Improve README.md (microsoft#1870)

### Motivation and Context

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`README.md` had several visual problems, which I decided to fix.

### Description

<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->

- The first problem was a `dotnet-ci` status badge, which is no longer
available. I replaced it with two status badges: `dotnet-ci-docker` and
`dotnet-ci-windows`.
- The second one was *Using Semantic Kernel in C# and Python*. The icons
were positioned out of place. I have made a small table with the icons
and hyperlinks present earlier.
- And finally, small corrections such as h3 lines for C# and Python
approaches above *getting started with the basics* instructions.

### Contribution Checklist
<!-- Before submitting this PR, please make sure: -->
- [x] The code builds clean without any errors or warnings
- [x] The PR follows SK Contribution Guidelines
(https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
- [x] The code follows the .NET coding conventions
(https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions)
verified with `dotnet format`
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

README.md

@@ -2,11 +2,12 @@
 
 [![Python package](https://img.shields.io/pypi/v/semantic-kernel)](https://pypi.org/project/semantic-kernel/)
 [![Nuget package](https://img.shields.io/nuget/vpre/Microsoft.SemanticKernel)](https://www.nuget.org/packages/Microsoft.SemanticKernel/)
-[![dotnet](https://github.com/microsoft/semantic-kernel/actions/workflows/dotnet-ci.yml/badge.svg?branch=main)](https://github.com/microsoft/semantic-kernel/actions/workflows/dotnet-ci.yml)
+[![dotnet Docker](https://github.com/microsoft/semantic-kernel/actions/workflows/dotnet-ci-docker.yml/badge.svg?branch=main)](https://github.com/microsoft/semantic-kernel/actions/workflows/dotnet-ci-docker.yml)
+[![dotnet Windows](https://github.com/microsoft/semantic-kernel/actions/workflows/dotnet-ci-windows.yml/badge.svg?branch=main)](https://github.com/microsoft/semantic-kernel/actions/workflows/dotnet-ci-windows.yml)
 [![License: MIT](https://img.shields.io/github/license/microsoft/semantic-kernel)](https://github.com/microsoft/semantic-kernel/blob/main/LICENSE)
 [![Discord](https://img.shields.io/discord/1063152441819942922?label=Discord&logo=discord&logoColor=white&color=d82679)](https://aka.ms/SKDiscord)
 
-> ℹ️ **NOTE**:This project is just like AI and will evolve quickly.
+> ℹ️ **NOTE**: This project is just like AI and will evolve quickly.
 > We invite you to join us in developing the Semantic Kernel together!
 > Please contribute by
 > using GitHub [Discussions](https://github.com/microsoft/semantic-kernel/discussions),
@@ -43,31 +44,41 @@ in the history of computing.
 
 Semantic Kernel is available to explore AI and build apps with C# and Python:
 
-<div style="display:flex;height:30px;padding:5px 0 5px 10px;">
-<img src="https://user-images.githubusercontent.com/371009/230673036-fad1e8e6-5d48-49b1-a9c1-6f9834e0d165.png" style="margin-right:12px" height="30"/>
-<a href="dotnet/README.md">Using Semantic Kernel in C#</a>.
-</div>
-
-<div style="display:flex;height:30px;padding:5px 0 5px 10px;">
-<img src="https://user-images.githubusercontent.com/371009/230673733-7a447d30-b48e-46e1-bd84-2b321c90649e.png" style="margin-right:12px" height="30"/>
-<a href="python/README.md">Using Semantic Kernel in Python</a>.
-</div>
-<br/>
+<table width=100%>
+  <tbody>
+    <tr>
+      <td>
+        <img align="left" width=52px src="https://user-images.githubusercontent.com/371009/230673036-fad1e8e6-5d48-49b1-a9c1-6f9834e0d165.png">
+        <div>
+          <a href="dotnet/README.md">Using Semantic Kernel in C#</a> &nbsp
+        </div>
+      </td>
+      <td>
+        <img align="left" width=52px src="https://raw.githubusercontent.com/devicons/devicon/master/icons/python/python-original.svg">
+        <div>
+          <a href="python/README.md">Using Semantic Kernel in Python</a>
+        </div>
+      </td>
+    </tr>
+  </tbody>
+</table>
 
 See the [Feature Matrix](FEATURE_MATRIX.md) to see a breakdown of feature parity between C# and Python.
 
 The quickest way to get started with the basics is to get an API key
 (OpenAI or Azure OpenAI)
 and to run one of the C# or Python console applications/scripts:
 
-For C#:
+### For C#:
+
 1. Create a new console app.
 2. Add the semantic kernel nuget `Microsoft.SemanticKernel`.
 3. Copy the code from [here](dotnet/README.md) into the app `Program.cs` file.
 4. Replace the configuration placeholders for API key and other params with your key and settings.
 5. Run with `F5` or `dotnet run`
 
-For Python:
+### For Python:
+
 1. Install the pip package: `python -m pip install semantic-kernel`.
 2. Create a new script e.g. `hello-world.py`.
 3. Store your API key and settings in an `.env` file as described [here](python/README.md).