DOC: simplify quickstart section

[hagenw]

This simplifies the quickstart section by focusing on how to load a dataset and get the corresponding labels.
It shortens the section by removing:

• Discussion of audb.avilable(), instead we only link to https://audeering.github.io/datasets/datasets.html
• Don't show db.descriptions and other YAML representations of the header
• Strip down the amount of written text

And adds a small signal, how to load and listen to an audio file.

The updated quickstart documentation now fits on a single screen page and looks like this:

Summary by Sourcery

Documentation:

• Simplify the quickstart section by focusing on loading datasets and obtaining labels, removing discussions on audb.available(), YAML representations, and reducing text.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR simplifies the quickstart documentation by streamlining the content to focus on essential dataset loading operations. The changes primarily involve removing verbose explanations and redundant information to create a more concise, single-screen guide.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Streamlined quickstart documentation content	Removed detailed discussion of audb.available() Removed YAML header representations and db.descriptions Reduced explanatory text Added direct link to datasets documentation Focused content on core dataset loading functionality	docs/quickstart.rst

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[sourcery-ai]

Hey @hagenw - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[ZYJGO]

it would be great to also have a section for playing a sample, since people(at least i) often want to listen to one after loading the dataset:)

[hagenw]

Would it be ok to add the following at the bottom of the page:

This requires that the dataset is already downloaded.
There is also the possibility to listen to an example file of a dataset, by downloading only that file:

db = audb.load("emodb", version="1.4.1", only_metadata=True, full_path=False)
media = audb.load_media("emodb", db.files[0], version="1.4.1")
signal, sampling_rate = audiofile.read(media[0], always_2d=True)

But I think, I would prefer to add those to a "Partial Loading" section under https://audeering.github.io/audb/load.html, where we can also discuss how to load a single table.

[ZYJGO]

okay i agree, just playing a random sample doesn't make much sense since we can also hear it here. adding it to "Partial Loading" and making it more functional maybe better

[hagenw]

I updated now the "Quickstart" section to show the example how to load the audio file with audiofile and how to listen to it with sounddevice.

And I created #477 to track adding a section on partial loading to the documentation.