docs: 添加mdbook

Author: zty012

docs/.gitignore

@@ -0,0 +1 @@
+book

docs/book.toml

@@ -0,0 +1,11 @@
+[book]
+title = "Project Graph"
+description = "无限画布上的思维操作系统。融合笔记、思维导图与系统分析， 用图论拓扑重构你的知识网络。"
+authors = ["zty012"]
+language = "zh-Hans"
+
+[rust]
+edition = "2024"
+
+[output.html]
+additional-css = ["./style.css"]

docs/src/404.md

@@ -0,0 +1 @@
+![http.cat/404](https://http.cat/404)

docs/src/README.md

@@ -0,0 +1,3 @@
+# 序章
+
+Coming S∞n...

docs/src/SUMMARY.md

@@ -0,0 +1 @@
+[序章](README.md)

docs/style.css

@@ -0,0 +1,16 @@
+:root,
+body,
+.content main {
+  font-family:
+    system-ui,
+    -apple-system,
+    BlinkMacSystemFont,
+    "Segoe UI",
+    Roboto,
+    Oxygen,
+    Ubuntu,
+    Cantarell,
+    "Open Sans",
+    "Helvetica Neue",
+    sans-serif;
+}