Add contest book (#6)

Add initial book and a workflow to build / deploy the book. I also created a few other configurations that we were missing.

Co-authored-by: Jaisurya Nanduri <91620234+jaisnan@users.noreply.github.com>

.github/CODEOWNERS

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+# Copyright Kani Contributors
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+
+*   @model-checking/kani-devs

.github/PULL_REQUEST_TEMPLATE.md

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+> Please add a description of your PR.
+> If this is a solution to an open challenge, please explain your solution.
+>
+> Don't forget to check our book to ensure your solution satisfy the overall
+> requirements as well as the challenge success criteria.
+>
+
+Resolves #ISSUE-NUMBER
+
+By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

.github/dependabot.yml

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+# Copyright Kani Contributors
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.gitignore

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+# Copyright Kani Contributors
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+
+## File system
+.DS_Store
+desktop.ini
+
+## Editor
+*.swp
+*.swo
+Session.vim
+.cproject
+.idea
+*.iml
+.vscode
+.project
+.favorites.json
+.settings/
+*.orig
+*.rej
+
+## Build
+/book/
+/build/
+/target
+*.rlib
+*.rmeta
+*.mir
+
+## Temporary files
+*~
+\#*
+\#*\#
+.#*
+
+## Python
+__pycache__/
+*.py[cod]
+*$py.class
+
+## Node
+node_modules
+package-lock.json
+
+# Tools
+## Kani
+*.out
+
+
+# Added by cargo
+#
+# already existing elements were commented out
+
+#/target