docs: introduce Mercury Notebook Deliverable Pattern

template/MercuryNotebook/config.toml

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+# Mercury app-shell theme — NTT DATA brand (light).
+# See docs/brand.md (repo root) for the source palette, and the CTM study's
+# config.toml for a fully-tuned example.
+#
+# Loaded from the directory where you launch `mercury` (this project root);
+# restart the server to apply changes. Only keys in mercury/config.py
+# CSS_VARIABLE_MAP emit a CSS variable; omitted keys are derived.
+
+[main]
+title = "Study Title — Business Case"
+favicon_emoji = "📊"
+footer = "Study footer line"
+notebooks_button_label = "Analyses"
+
+[welcome]
+header = "Study Title"
+message = """
+Interactive business-case notebooks. Tune the 🟡 inputs live for the
+client, then export the personalized report source with
+`python scripts/export_report.py`.
+"""
+
+[theme]
+# ── Type — Georgia headings, Arial body (web-safe; no font fetch) ──
+font_family         = "Arial, 'Helvetica Neue', Helvetica, sans-serif"
+heading_font_family = "Georgia, 'Times New Roman', Times, serif"
+font_size           = "15px"
+font_weight         = "normal"
+heading_font_weight = "700"
+
+# ── Text — NTT ink scale ──
+text_color       = "#2e404d"
+muted_text_color = "#586671"
+
+# ── Surfaces — white content on a soft neutral canvas ──
+background_color         = "#f4f5f6"
+content_background_color = "#ffffff"
+surface_color            = "#ffffff"
+card_background_color    = "#f8f8f8"
+border_color             = "#d5d9db"
+border_radius            = "10px"
+
+# ── Accents — Future Blue; primary_color also drives Run button + focus ──
+primary_color             = "#0072bc"
+accent_color              = "#0072bc"
+focus_border_color        = "#0072bc"
+hover_background_color    = "#eef5fb"
+selected_background_color = "#dcecfa"
+
+# ── Sidebar / top bar / footer ──
+sidebar_background_color = "#ffffff"
+sidebar_text_color       = "#2e404d"
+sidebar_title_color      = "#151d2c"
+sidebar_shadow           = "1px 0 0 #d5d9db"
+topbar_background_color  = "#151d2c"
+topbar_text_color        = "#ffffff"
+topbar_border_color      = "rgba(255,255,255,0.08)"
+footer_background_color  = "#ffffff"
+footer_text_color        = "#586671"
+footer_border_color      = "#d5d9db"