feat(ktl-2781): added data for case studies page

data/case-studies/_case-study.example.yaml

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+# CaseItem (data contract for a single case study entry)
+#
+# Required fields:
+# - id: string — unique identifier of the case
+# - description: string — markdown-enabled text (supports **bold** and [links](https://example.com))
+# - type: string — one of: multiplatform | server-side
+#
+# Optional fields:
+# - logo: list (0–2) of image paths (strings)
+#     Use up to two logos. Paths can be absolute (starting with "/") or full URLs.
+#
+# - signature: object — author or source of the quote
+#     line1: string — supports markdown (e.g., **Name Surname**, Role)
+#     line2: string — plain text
+#
+# - destination: string — either internal or external
+#     internal: the card points to an internal MDX page (see pageContentPath)
+#     external: the card points to an external resource (see externalUrl)
+#
+# - externalLink: string — external link for the card (used when destination: external)
+#
+# - externalLinkText: string — text for the external link (used when destination: external)
+#
+# - platforms: list of strings — platform tags shown on the card
+#     Examples: android, ios, desktop, frontend, backend, compose-multiplatform
+#
+# - media: object — media block for the card
+#     type: youtube | image
+#     When type: youtube
+#       url: string — YouTube link
+#     When type: image
+#       path: string — image path relative to /public/ directory
+#
+# - featuredOnMainPage: boolean — mark this case to be highlighted on the main page
+#
+# - slug: string — optional URL segment for the internal case page; if omitted, id is used
+#     Use a single URL segment (no slashes, no section prefix).
+#
+# - pageContentPath: string — path to the detailed case content in MDX (used when destination: internal)
+
+items:
+  - id: CompanyName        # required: unique identifier
+    type: server-side        # required: multiplatform | server-side
+    description: >        # required: markdown-supported text
+      **Case description** supporting [links](https://example.com) and emphasis.
+    logo:        # optional: list of 0–2 image paths (strings)
+      - /images/case-studies/google.svg
+      - /images/case-studies/google.svg
+    signature:        # optional
+      line1: "**Name Surname**"
+      line2: "Position at Company or note"
+    destination: external      # optional: internal | external
+    externalLink: https://example.com/full-story        # optional
+    externalLinkText: Read the full story        # optional
+    platforms:        # optional
+      - android
+      - ios
+      - desktop
+      - frontend
+      - backend
+      - compose-multiplatform
+    media:        # optional
+      type: youtube        # required: youtube | image
+      url: https://youtu.be/o14wGByBRAQ?si=TmqJBtfZw2F8-IEw&t=7
+      # when type: image
+            # type: image
+            # path: ./images/case-studies/google.svg
+    featuredOnMainPage: false   # optional: mark case as selected for the main page
+    slug: example-slug        # optional: if not set, id will be used
+    # Specify one of the two fields (not both):
+    pageContentPath: ./data/case-studies/_case-study.example/index.mdx  # path to MDX file with page content
+    # OR
+    internalLink: https://kotlinlang.org/lp/server-side/case-studies/example-slug/  # direct link to existing page

data/case-studies/_case-study.example/index.mdx

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+---
+id: unique-id-derived-from-company
+company: CompanyName
+industry: Some service
+size: 3000+
+country: USA, San Francisco
+---
+
+# CompanyName: Kotlin for backend at scale
+
+Description
+
+## Context
+
+- Items
+- Reasons
+- Results
+
+> Cites, emphasis, links
+
+![Image](/images/case-studies/google_logo.svg)
+
+## Outcomes
+
+CTA, links, etc.