Add YC open source companies to OSS friends page (#2173)

- Probo: Open source compliance automation (SOC2, GDPR, ISO27001)
- Epicenter: Local-first speech-to-text app
- Mastra: TypeScript AI agent framework
- Firecrawl: Web data API for AI
- Highlight: Full-stack monitoring platform
- Helicone: LLM observability platform
- Trieve: Search, recommendations, and RAG platform

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: [email protected] <[email protected]>

Author: devin-ai-integration[bot]

apps/web/content/oss-friends/epicenter.mdx

@@ -0,0 +1,6 @@
+---
+name: Epicenter
+description: Press shortcut, speak, get text. Free and open source local-first speech-to-text app.
+href: https://epicenter.so
+github: https://github.com/EpicenterHQ/epicenter
+---

apps/web/content/oss-friends/firecrawl.mdx

@@ -0,0 +1,6 @@
+---
+name: Firecrawl
+description: The Web Data API for AI. Turn entire websites into LLM-ready markdown or structured data.
+href: https://firecrawl.dev
+github: https://github.com/mendableai/firecrawl
+---

apps/web/content/oss-friends/helicone.mdx

@@ -0,0 +1,6 @@
+---
+name: Helicone
+description: Open source LLM observability platform. One line of code to monitor, evaluate, and experiment with your AI apps.
+href: https://www.helicone.ai
+github: https://github.com/Helicone/helicone
+---

apps/web/content/oss-friends/highlight.mdx

@@ -0,0 +1,6 @@
+---
+name: Highlight
+description: Open source full-stack monitoring platform. Error monitoring, session replay, logging, and distributed tracing.
+href: https://highlight.io
+github: https://github.com/highlight/highlight
+---

apps/web/content/oss-friends/mastra.mdx

@@ -0,0 +1,6 @@
+---
+name: Mastra
+description: The TypeScript AI agent framework. Build assistants with RAG, observability, and support for GPT-4, Claude, Gemini, and Llama.
+href: https://mastra.ai
+github: https://github.com/mastra-ai/mastra
+---

apps/web/content/oss-friends/probo.mdx

@@ -0,0 +1,6 @@
+---
+name: Probo
+description: Open source solutions for SOC2, GDPR, and ISO27001. Compliance automation for modern teams.
+href: https://www.getprobo.com
+github: https://github.com/getprobo/probo
+---

apps/web/content/oss-friends/trieve.mdx

@@ -0,0 +1,6 @@
+---
+name: Trieve
+description: All-in-one platform for search, recommendations, RAG, and analytics offered via API.
+href: https://trieve.ai
+github: https://github.com/devflowinc/trieve
+---