[doc] remove unused pages

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+Soledad sync process
+====================
+
+TODO: this documentation needs to be updated to account for new streaming encryption method.
+
+Phases of sync:
+
+1. client acquires knowledge about server state.
+2. client sends its documents to the server.
+3. client downloads documents from the server.
+4. client records its new state on the server.
+
+Originally in u1db:
+
+* **1** is a GET,
+* **2** and **3** are one POST (send in body, receive in response),
+* **4** is a PUT.
+
+In soledad:
+
+* **1** is a GET.
+* **2** is either 1 or a series of sequential POSTS.
+    * **2.1** encrypt asynchronously
+    * **2.2** store in temp sync db
+    * **2.3** upload sequentially
+* **3** is a series of concurrent POSTS, insert sequentially on local client db.
+    * **3.1** download concurrently
+    * **3.2** store in temp sync db
+    * **3.3** decrypt asynchronously
+    * **3.4** insert sequentially in local client db
+* **4** is a PUT.
+
+This difference between u1db and soledad was made in order to be able to gracefully interrupt the sync in the middle of the upload or the download.
+
+it is essential that all the uploads and downloads are sequential: documents must be added in order. the download happens in parallel, but then locally they are added sequentially to the local db.