added serve-docs and manpage

debian/blag.1

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+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.49.3.
+.TH BLAG "1" "July 2024" "blag 2.3.0" "User Commands"
+.SH NAME
+blag \- blog-aware, static site generator
+.SH DESCRIPTION
+usage: blag [\-h] [\-\-version] [\-v] {build,quickstart,serve} ...
+.SS "positional arguments:"
+.IP
+{build,quickstart,serve}
+.TP
+build
+Build website.
+.TP
+quickstart
+Quickstart blag, creating necessary configuration.
+.TP
+serve
+Start development server.
+.SS "options:"
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+show this help message and exit
+.TP
+\fB\-\-version\fR
+show program's version number and exit
+.TP
+\fB\-v\fR, \fB\-\-verbose\fR
+Verbose output.