docs: ridiculous chapters... unlikely to finish

Signed-off-by: Alex Chi <iskyzh@gmail.com>

mini-lsm-book-wip/src/15-io-optimization.md

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+# I/O Optimization

mini-lsm-book-wip/src/16-compression.md

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+# Block Compression

mini-lsm-book-wip/src/17-async.md

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+# Async Engine

mini-lsm-book-wip/src/18-serializable.md

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+# Serializable Snapshot Isolation

mini-lsm-book-wip/src/19-sql.md

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+# SQL over Mini LSM

mini-lsm-book-wip/src/SUMMARY.md

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 ---
 
-# Week 1 -- Storage Format
+# Week 1: Storage Format
 
 - [Blocks](./01-block.md)
 - [Sorted String Table (SST)](./02-sst.md)
 - [Merge Iterators](./03-memtable.md)
 - [Storage Engine](./04-engine.md)
 
-# Week 2 -- Compaction and Persistence
+# Week 2: Compaction and Persistence
 
 - [Compaction Task](./05-compaction.md)
 - [Compaction Strategy](./06-compaction-strategy.md)
-- [Write-Ahead Log (WAL)](./07-recovery.md)
+- [Write-Ahead Log (WAL) and Manifest](./07-recovery.md)
 - [Bloom Filter](./08-bloom-filter.md)
 - [Key Compression](./09-key-compression.md)
 
-# Week 3 -- Multi-Version Concurrency Control
+# Week 3: MVCC
 
 - [Encode the Timestamp](./10-ts.md)
 - [Prefix Bloom Filter](./11-prefix-bloom-filter.md)
 - [Read with Timestamp](./12-mvcc-read.md)
 - [Snapshots and Watermark](./13-watermark.md)
 - [Garbage Collection](./14-garbage-collection.md)
+
+# The Rest of Your Life
+
+- [I/O Optimization](./15-io-optimization.md)
+- [Block Compression](./16-compression.md)
+- [Async Engine](./17-async.md)
+- [Serializable Snapshot Isolation](./18-serializable.md)
+- [SQL over Mini LSM](./19-sql.md)