Move doc/HACKING/design/01b-collections.md into doxygen.

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-
-## Collections in tor
-
-### Smartlists: Neither lists, nor especially smart.
-
-For historical reasons, we call our dynamic-allocated array type
-`smartlist_t`.  It can grow or shrink as elements are added and removed.
-
-All smartlists hold an array of `void *`.  Whenever you expose a smartlist
-in an API you *must* document which types its pointers actually hold.
-
-<!-- It would be neat to fix that, wouldn't it? -NM  -->
-
-Smartlists are created empty with `smartlist_new()` and freed with
-`smartlist_free()`.  See the `containers.h` module documentation for more
-information; there are many convenience functions for commonly needed
-operations.
-
-<!-- TODO: WRITE more about what you can do with smartlists. -->
-
-### Digest maps, string maps, and more.
-
-Tor makes frequent use of maps from 160-bit digests, 256-bit digests,
-or nul-terminated strings to `void *`. These types are `digestmap_t`,
-`digest256map_t`, and `strmap_t` respectively.  See the containers.h
-module documentation for more information.
-
-### Intrusive lists and hashtables
-
-For performance-sensitive cases, we sometimes want to use "intrusive"
-collections: ones where the bookkeeping pointers are stuck inside the
-structures that belong to the collection.  If you've used the
-BSD-style sys/queue.h macros, you'll be familiar with these.
-
-Unfortunately, the `sys/queue.h` macros vary significantly between the
-platforms that have them, so we provide our own variants in
-`src/ext/tor_queue.h`.
-
-We also provide an intrusive hashtable implementation in `src/ext/ht.h`.
-When you're using it, you'll need to define your own hash
-functions. If attacker-induced collisions are a worry here, use the
-cryptographic siphash24g function to extract hashes.
-
-<!-- TODO: WRITE about bloom filters, namemaps, bit-arrays, order functions.
--->