docs: Convert manual pages into per-module Markdown pages

docs/reference/blob/fs.md

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+# Filesystem
+
+This module stores message bodies in a file system directory.
+
+```
+storage.blob.fs {
+    root <directory>
+}
+```
+```
+storage.blob.fs <directory>
+```
+
+## Configuration directives
+
+**Syntax:** root _path_ <br>
+**Default:** not set
+
+Path to the FS directory. Must be readable and writable by the server process.
+If it does not exist - it will be created (parent directory should be writable
+for this). Relative paths are interpreted relatively to server state directory.
+

docs/reference/blob/s3.md

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+# Amazon S3
+
+storage.blob.s3 module stores messages bodies in a bucket on S3-compatible storage.
+
+```
+storage.blob.s3 {
+    endpoint play.min.io
+    secure yes
+    access_key "Q3AM3UQ867SPQQA43P2F"
+    secret_key "zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG"
+    bucket maddy-test
+
+    # optional
+    region eu-central-1
+    object_prefix maddy/
+}
+```
+
+Example:
+```
+storage.imapsql local_mailboxes {
+    ...
+    msg_store s3 {
+        endpoint s3.amazonaws.com
+        access_key "..."
+        secret_key "..."
+        bucket maddy-messages
+        region us-west-2
+    }
+}
+```
+
+## Configuration directives
+
+**Syntax:** endpoint _address:port\_
+
+REQUIRED.
+
+Root S3 endpoint. e.g. s3.amazonaws.com
+
+**Syntax:** secure _boolean_ <br>
+**Default:** yes
+
+Whether TLS should be used.
+
+**Syntax:** access\_key _string_ <br>
+**Syntax:** secret\_key _string\_
+
+REQUIRED.
+
+Static S3 credentials.
+
+**Syntax:** bucket _name\_
+
+REQUIRED.
+
+S3 bucket name. The bucket must exist and
+be read-writable.
+
+**Syntax:** region _string_ <br>
+**Default:** not set
+
+S3 bucket location. May be called "endpoint"
+in some manuals.
+
+**Syntax:** object\_prefix _string_ <br>
+**Default:** empty string
+
+String to add to all keys stored by maddy.
+
+Can be useful when S3 is used as a file system.