Restructure intro, getting started and tutorial

[burnash]

Description

This PR:

• Adds more dlt topics coverage to the tutorial.
• Restructures "Getting started" and "Introduction" pages.

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[AstrakhantsevaAA]

wow huge work!

imo:

• Now I don’t really see the differences between the tutorial and how-to guides. if we combine them, nothing will change.
• The Getting Started page has also lost its relevance. they are now similar to the Introduction page. maybe makes sense to merge them too?

update: at least the title Load data with API do not reflect the content. I got the idea of the tutorial section: it is something between How-to and using-dlt. mb rename it to "Load data with append, replace, merge mode"

[burnash]

@AstrakhantsevaAA thanks for the comment!

Now I don’t really see the differences between the tutorial and how-to guides. if we combine them, nothing will change.

There should be a difference in the level of specificity: tutorial is a more general guide that teaches the core concepts, where how-to guides are more specific steps of instructions.

The Getting Started page has also lost its relevance. they are now similar to the Introduction page. maybe makes sense to merge them too?

• I don't think Getting Started lost its relevance: I shortened the page so it's really a quick start: Install – Load - View.
• Introduction is an overview of dlt: what that is + a brief showcase of different sources

[burnash]

update: at least the title Load data with API do not reflect the content. I got the idea of the tutorial section: it is something between How-to and using-dlt. mb rename it to "Load data with append, replace, merge mode"

I believe an uninitiated user won't know what is append, replace and merge: the point of the first part is to teach them what that actually is and why they may need to use different loading modes.
I'm open to suggestion of a better naming for the section. My goal is to summarize the content of the first part.

[rudolfix]

1. PDF to weaviate is not visible in the index in the walkthrough
2. I'd move it to examples. it looks way more like example to me. and we have too many walkthroughs
3. the test for the above does not pass
4. we have two files deploy_to_github_actions and dispatch-to-multiple-tables in the top level dir. (docs/website/docs) looks like a mistake

regarding content. tutorial is cool!
IMO removing the tabs with various examples from getting started is not a good idea. it showcases what you can do with dlt in a few lines of code and I was using it a lot when talking to users on slack to show how you can deal with pandas, csv or databases quickly. so practically I need that content somewhere at the top.

[AstrakhantsevaAA]

In recent days, I have often heard positive feedback from users about Getting Started page, I quote, “it’s convenient that by going through one page you can generally understand how the tool works.” It was good that it briefly showed how the tool works, without going into too much detail.
The tutorial is needed for a deeper understanding of these principles

[burnash]

@AstrakhantsevaAA thanks for the feedback. The content from the getting started is still in the docs, I've moved it to the first part of the tutorial. My hypothesis is that it would not affect the understanding of the material. Another is that having a cohesive storyline also aids people in grasping dlt's key concepts fast.