fmt: initial support for mdbook

fmt/mdbook/SUMMARY.md

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+# Summary
+
+- [Index](./index.md)
+- [Download](./index.md)
+- [CookBooks](./index.md)
+    - [Devel](./cookbooks/devel/core.md)
+    - [5.5.x](./cookbooks/5.5.x/core.md)
+    - [5.4.x](./cookbooks/5.4.x/core.md)
+    - [5.3.x](./cookbooks/5.3.x/core.md)
+    - [5.2.x](./cookbooks/5.2.x/core.md)
+    - [5.1.x](./cookbooks/5.1.x/core.md)
+    - [5.0.x](./cookbooks/5.0.x/core.md)
+    - [4.4.x](./cookbooks/4.4.x/core.md)
+    - [4.3.x](./cookbooks/4.3.x/core.md)

fmt/mdbook/book.toml

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+[book]
+authors = ["Kamailio Developers and Contributors"]
+language = "en"
+multilingual = false
+src = "../../docs"
+title = "Kamailio Wiki Documentation"

fmt/mdbook/src/SUMMARY.md

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+# Summary
+
+- [Chapter 1](./chapter_1.md)

fmt/mdbook/src/chapter_1.md

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+# Chapter 1