Fix doc issues from review: typos, missing frontmatter, File Server r…

[Kanishkrawatt]

…ename, nav cleanup

• Remove empty account/sso.mdx page
• Fix "bowser" typo in filename, slug, and all references → "browser"
• Add full frontmatter to send-soap.mdx (slug, description, SEO fields, visibility)
• Rename untitled-page changelog files to proper dates (feb-16, mar-02, mar-09)
• Add mar-26-2026 changelog to docs.json nav; remove missing untitled-page-1 entry
• Remove orphaned api-client/quick-start.mdx (duplicate of overview, not in nav)
• Flesh out collaboration/workspaces.mdx with nav cards and Info callout clarifying project = workspace naming
• Fix broken overview tip link (bowser typo + wrong path → difference-between page)
• Rename "Mock Server" → "File Server" across all content and docs.json nav group
• Fix typos: "network lots" → "logs", "How It Import" → "Imports", "automatcially" → "automatically"
• Fill empty description fields in environments-and-variables.mdx and desktop-app.mdx
• Fix wrong troubleshoot link in api-client/overview.mdx
• Remove redundant "For example:" in send-soap.mdx
• Fix "manually new query" → "manually add a new query" in graphql-request.mdx
• Add What's Next section to collection-runner.mdx
• Remove empty src="" image tags from shared-list.mdx
• Remove account/sso from docs.json nav; keep SSO sub-pages