feat: add 50 open source blog posts and author avatar support

[ig-imanish]

Title

feat: publish 50 open source blog posts from tracking issue + author avatar support

Closes: #9

What

Implements the blog topic backlog in #9. Publishes 50 new posts across all nine keyword clusters, plus author avatar support so posts render with the correct byline image.

Blog posts

• Discovery platforms (5): best platforms to discover OSS, top 10 websites, finding projects for startups, directories and curated lists, how ossium surfaces trending repos
• OSS basics (6): what is open source, open source vs free software vs freeware, top 50 projects, alternatives to paid software, OSS for startups, history from GNU to GitHub
• "Best Open Source X" listicles (14): CRM, project management, CMS, analytics, AI/ML frameworks, databases, e-commerce, design, DevOps/CI-CD, security and pentesting, chat, video editing, note-taking, home lab apps
• Contributor content (4): first-time contributor projects, starting a project, building a community, maintainer burnout
• Comparisons (4): ossium vs Product Hunt, OSS vs proprietary, self-hosted vs cloud-hosted, top repos by stars
• Business and career (5): why companies adopt OSS, SaaS on open source, business models, career boost, companies hiring contributors
• Trends (4): trending this month, new launches 2026, state of open source 2026, AI projects to watch
• Ossium feature pages (3): search by language, filter by license, features explained
• FAQ/question posts (5): is OSS safe, free forever, commercial use, what does OSS mean, how developers make money

Skipped topics already published: Ossium vs GitHub Explore, how to contribute, finding beginner-friendly projects, Hacktoberfest guide.

Author avatar support

• New optional avatar frontmatter field (lib/content/types.ts, lib/content/parse.ts)
• Post page now renders post.avatar with a fallback to the ossium logo when absent (app/[slug]/page.tsx)
• All new posts authored as OpenCode with avatar: /logo/opencode-logo-dark.png
• Frontmatter spec updated in content/posts/README.md

Verification

• pnpm test: 26 passed
• pnpm typecheck: clean
• pnpm lint: clean
• All 50 posts under 1000 words, no em dashes, no broken internal links, UTF-8 preserved (rupee signs intact)

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Project	Deployment	Actions	Updated (UTC)
blogs	Ready	Preview	Aug 8, 2026 3:00pm