Improve Pulse docs: "What is Pulse?" and "Getting started"

[nikolasburk]

I made a couple of changes that I hope make it easier for people to understand what Pulse is, what value it provides and getting started with it.

Nothing too fundamental, just a few things I thought should be improved:

• What is Pulse?
  • Added more structure/headings to the page
  • Laid out use case and features (based on the value messaging guide)
  • Update existing and add new illustrations (design tasks are here)
  • Adjusted and expanded on some of the existing explanations
• Getting started
  • Clean up prerequisites
  • Divide step 1. into smaller steps to handhold the reader more
  • Change prisma.notification.subscribe() to prisma.user.subscribe() and add the corresponding Prisma schema in a tab
  • add step 3. to test the subscription
  • updated "Next steps" with more filter examples

FWIW: I didn't do that yet but I think we should also (in the future) instruct people to run prisma migrate in these instructions to really have a fully step-by-step tutorial that doesn't leave room for error

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This PR probably requires the following redirects to be added to static/_redirects:

• This PR does not change any pages in a way that would require a redirect.

[github-actions]

original	preview
content/400-pulse/100-what-is-pulse.mdx	content/400-pulse/100-what-is-pulse.mdx
content/400-pulse/200-getting-started.mdx	content/400-pulse/200-getting-started.mdx

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 34.3%, saving 95.58 KB.

Filename	Before	After	Improvement	Visual comparison
static/img/pulse/overview.png	185.94 KB	121.14 KB	-34.8%	View diff
static/img/pulse/unidirectional-data-flow.png	92.74 KB	61.96 KB	-33.2%	View diff

148 images did not require optimisation.

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[jharrell]

Few minor changes and some questions

[petradonka]

@nikolasburk, this is great, thanks so much for adding these details! 🙏

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 12.7%, saving 54.05 KB.

Filename	Before	After	Improvement	Visual comparison
static/img/pulse/overview.png	274.96 KB	247.18 KB	-10.1%	View diff
static/img/pulse/unidirectional-data-flow.png	151.05 KB	124.78 KB	-17.4%	View diff

148 images did not require optimisation.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 4.6%, saving 4.06 KB.

Filename	Before	After	Improvement	Visual comparison
static/img/pulse/user-insert.png	88.28 KB	84.22 KB	-4.6%	View diff

150 images did not require optimisation.