docs(mail_intake): add MkDocs navigation and API reference document structure

- docs(mkdocs.yml): define navigation structure for mail_intake modules
- docs(mkdocs.yml): configure mkdocstrings for Python API rendering
- docs(docs): add documentation root and mail_intake index page
- docs(docs): add adapters documentation pages with mkdocstrings directives
- docs(docs): add auth documentation pages with mkdocstrings directives
- docs(docs): add ingestion documentation pages with mkdocstrings directives
- docs(docs): add models documentation pages with mkdocstrings directives
- docs(docs): add parsers documentation pages with mkdocstrings directives
- docs(docs): add config and exceptions documentation pages

docs/mail_intake/adapters/base.md

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+# Base
+
+::: mail_intake.adapters.base

docs/mail_intake/adapters/gmail.md

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+# Gmail
+
+::: mail_intake.adapters.gmail

docs/mail_intake/adapters/index.md

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+# Adapters
+
+::: mail_intake.adapters

docs/mail_intake/auth/base.md

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+# Base
+
+::: mail_intake.auth.base

docs/mail_intake/auth/google.md

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+# Google
+
+::: mail_intake.auth.google

docs/mail_intake/auth/index.md

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+# Auth
+
+::: mail_intake.auth

docs/mail_intake/config.md

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+# Config
+
+::: mail_intake.config

docs/mail_intake/exceptions.md

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+# Exceptions
+
+::: mail_intake.exceptions

docs/mail_intake/index.md

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+# Mail Intake
+
+::: mail_intake

docs/mail_intake/ingestion/index.md

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+# Ingestion
+
+::: mail_intake.ingestion

docs/mail_intake/ingestion/reader.md

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+# Reader
+
+::: mail_intake.ingestion.reader

docs/mail_intake/models/index.md

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+# Models
+
+::: mail_intake.models

docs/mail_intake/models/message.md

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+# Message
+
+::: mail_intake.models.message

docs/mail_intake/models/thread.md

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+# Thread
+
+::: mail_intake.models.thread

docs/mail_intake/parsers/body.md

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+# Body
+
+::: mail_intake.parsers.body

docs/mail_intake/parsers/headers.md

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+# Headers
+
+::: mail_intake.parsers.headers

docs/mail_intake/parsers/index.md

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+# Parsers
+
+::: mail_intake.parsers

docs/mail_intake/parsers/subject.md

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+# Subject
+
+::: mail_intake.parsers.subject