feat: add pulse railway starter app+ db docs

[ankur-arch]

No description provided.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 25, 2024 9:02am

[github-actions]

This PR changes the following pages (Vercel Preview Deploy links):

Changed Vercel links

• /docs/pulse/getting-started (currently)
• /docs/pulse/database-setup/railway (currently)
• /docs/pulse/images/railway-database-url.png (currently)
• /docs/pulse/images/railway-template-configure.png (currently)

(Note that links will only be valid after Vercel preview deploy succeeded)

[github-actions]

This PR probably requires the following redirects to be added to vercel.json:

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

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 45.9%, saving 129.27 KB.

Filename	Before	After	Improvement	Visual comparison
content/400-pulse/images/railway-database-url.png	281.54 KB	152.28 KB	-45.9%	View diff

158 images did not require optimisation.

[nikolasburk]

first round of feedback for the "DB only" template. tackling the one with the app starter next.

overall: this looks much better compared to yesterday already!! 💪

[nikolasburk]

leaving some change requests already but the step-by-step instructions in the Setup with template: “Prisma Pulse DB & App” section need to be more accurate/detailed. (See Slack for more info.)

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 23.4%, saving 176.40 KB.

Filename	Before	After	Improvement	Visual comparison
content/400-pulse/images/railway-template-configure.png	754.53 KB	578.13 KB	-23.4%	View diff

159 images did not require optimisation.