[FAB-4234] Update Intro Graphics

Removes unsynchronized images and updates
graphics. Fabric -> Hyperledger Fabric per cbf
[ci-skip]

Change-Id: I8464ac4d6d9c653aef6f3bb38ab8499017bcba8b
Signed-off-by: Nick Gaski <[email protected]>

Author: nickgaski

docs/source/blockchain.rst

@@ -1,22 +1,22 @@
 Introduction
 ============
-Hyperledger Fabric is a platform for distributed ledger solutions underpinned 
+Hyperledger Fabric is a platform for distributed ledger solutions underpinned
 by a modular architecture delivering high degrees of confidentiality,
 resiliency, flexibility and scalability. It is designed to support pluggable
 implementations of different components and accommodate the complexity and
 intricacies that exist across the economic ecosystem.
 
-Fabric delivers a uniquely elastic and extensible architecture, distinguishing
+Hyperledger Fabric delivers a uniquely elastic and extensible architecture, distinguishing
 it from alternative blockchain solutions. Planning for the future of enterprise
 blockchain requires building on top of a fully vetted, open-source architecture;
 Hyperledger Fabric is your starting point.
 
-We recommended first-time users begin by going through the rest of the 
-introduction below in order to gain familiarity with how blockchains work 
-and with the specific features and components of Fabric. 
+We recommended first-time users begin by going through the rest of the
+introduction below in order to gain familiarity with how blockchains work
+and with the specific features and components of Hyperledger Fabric.
 
-Once comfortable -- or if you're already familiar with blockchain and 
-Hyperledger Fabric -- go to :doc:`getting_started` and from there explore the 
+Once comfortable -- or if you're already familiar with blockchain and
+Hyperledger Fabric -- go to :doc:`getting_started` and from there explore the
 demos, technical specifications, APIs, etc.
 
 What is a Blockchain?
@@ -41,8 +41,7 @@ simple to determine the provenance of information because participants can be
 sure information has not been changed after the fact. It’s why blockchains
 are sometimes described as **systems of proof**.
 
- 
-**Smart Contracts**
+ **Smart Contracts**
 
 To support the consistent update of information – and to enable a whole host of
 ledger functions (transacting, querying, etc) – a blockchain network uses **smart
@@ -89,7 +88,6 @@ ownership of it.
 
 What you’re left with is a business network that looks like this:
 
-
 .. image:: images/current_network.png
 
 Modern technology has taken this process from stone tablets and paper folders
@@ -105,7 +103,6 @@ It’s impossible with today’s fractured approach to information and
 process sharing to build a system of record that spans a business network, even
 though the needs of visibility and trust are clear.
 
-
 **The Blockchain Difference**
 
 What if instead of the rat’s nest of inefficiencies represented by the “modern”
@@ -133,7 +130,6 @@ You now know what blockchain is and why it’s useful. There are a lot of other
 details that are important, but they all relate to these fundamental ideas of
 the sharing of information and processes.
 
-
 What is Hyperledger Fabric?
 ---------------------------
 
@@ -158,25 +154,19 @@ Fabric also offers several pluggable options. Ledger data can be stored in
 multiple formats, consensus mechanisms can be switched in and out,
 and different membership service providers are supported.
 
-Fabric also offers the ability to create **channels**, allowing a group of
+Hyperledger Fabric also offers the ability to create **channels**, allowing a group of
 participants to create a separate ledger of transactions. This is an especially
 important option for networks where some participants might be competitors and not
 want every transaction they make - a special price they're offering to some participants
 and not others, for example - known to every participant. If two
 participants form a channel, then those participants – and no others – have copies
 of the ledger for that channel.
 
-The following diagram outlines the four building blocks of Hyperledger Fabric:
-
-.. image:: images/Requirements.png
-
 **Shared Ledger**
 
 Hyperledger Fabric has a ledger subsystem comprising two components: the **world
 state** and the **transaction log**. Each participant has a copy of the ledger to
-every Fabric network they belong to.
-
-.. image:: images/what.png
+every Hyperledger Fabric network they belong to.
 
 The world state component describes the state of the ledger at a given point
 in time. It’s the database of the ledger. The transaction log component records
@@ -197,8 +187,6 @@ application needs to interact with the ledger. In most cases chaincode only
 interacts with the database component of the ledger, the world state (querying
 it, for example), and not the transaction log.
 
-.. image:: images/sContracts.png
-
 You can write chaincode in several programming languages. Currently supported
 languages include GOLANG and Java with others coming soon.
 
@@ -208,8 +196,6 @@ Depending on the needs of a network, participants in a Business-to-Business
 (B2B) network might be extremely sensitive about how much information they share.
 For other networks, privacy will not be a top concern.
 
-.. image:: images/Lock.png
-
 Hyperledger Fabric supports networks where privacy (using channels) is a key
 operational requirement as well as networks that are comparatively open.
 
@@ -221,9 +207,6 @@ network. For this to happen, the order of transactions must be established
 and a method for rejecting bad transactions that have been inserted into the
 ledger in error (or maliciously) must be put into place.
 
-.. image:: images/handshake.png
-
-
 This is a thoroughly researched area of computer science, and there are many
 ways to achieve it, each with different trade-offs. For example, PBFT (Practical
 Byzantine Fault Tolerance) can provide a mechanism for file replicas to
@@ -242,7 +225,6 @@ We’ll learn more about the Hyperledger Fabric consensus mechanisms, which
 currently include SOLO, Kafka, and will soon extend to SBFT (Simplified
 Byzantine Fault Tolerance), in another document.
 
-
 Where can I learn more?
 -----------------------
 
@@ -277,7 +259,7 @@ By the time you’re through, you’ll be ready to start working with key
 stakeholders in your company to design a business network that uses Hyperledger
 Fabric.
 
-:doc:`planning_guide`
+Best Practices (coming soon)
 
 Deals with the practical concerns of setting up and managing a production
 Hyperledger Fabric blockchain. You’ll understand the key factors to consider