doc: Add overview and multi account case placeholder

Create a placeholder for the multi account setup case. Also complete
with an overview of configuration cases.

diff --git a/doc/multi.mdwn b/doc/multi.mdwn
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+---
+title: |
+ Case of setting up InterIMAP for multiple email accounts with Dovecot
+ and Mutt for Fripost account on Debian
+...
+
+This case guide explains the setup of InterIMAP against two separate
+email accounts, e.g. work and private. The guide also covers the
+overview of configuration philosophy and strategy.
+
+*TODO Cover this case*

diff --git a/doc/overview.mdwn b/doc/overview.mdwn
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+---
+title: Overview of configuration cases
+...
+
+A few cases of configuration are covered as part of this
+documentation:
+
+ 1. [Baseline case](baseline.mdwn) -- InterIMAP with Dovecot and Mutt
+    on Debian
+
+ 2. [Multi account setup](multi.mdwn) -- Expansion of baseline for
+    multiple email accounts
+
+Start with the baseline configuration and apply expansions as needed.