Remove external links in non-conforming EIPs (ethereum#2753)

Per ethereum#2648, I'm removing links to external images and instead placing them in the proper /assets directory.

EIPS/eip-1175.md

@@ -14,7 +14,7 @@ requires: 20
 ## Simple Summary
 Make wallets and shops created from certified contracts make erc20 tokens easy to use for commerce.
 
-![wallet](https://user-images.githubusercontent.com/11692220/41762799-ee17c480-7636-11e8-9930-681be2c59b56.png)
+![wallet](/assets/eip-1175/wallet.png)
 
 ## Abstract
 The mutual trust between the wallet and the shop created by the authenticated contract allows you to pay for and purchase items at a simple process.
@@ -25,7 +25,7 @@ New standards with improvements have been released, but the majority of tokens c
 And if you only reuse the store interface, you can also trade using `payUnsafe (address _shop, uint256 _item)`.
 
 ## Specification
-![workflow](https://user-images.githubusercontent.com/11692220/41841025-2ed6e024-78a2-11e8-9faf-2b43aeaa2303.png)
+![workflow](/assets/eip-1175/workflow.png)
 ## WalletCenter
 ### Methods
 #### createWallet

EIPS/eip-1438.md

@@ -25,7 +25,7 @@ While many projects are under development in an open source way, they are simply
 
 
 #### The following avatar store, badge system, and universal wallet are kind of examples about component dApp.
-![intro](https://user-images.githubusercontent.com/11692220/45585539-ef51af00-b920-11e8-876b-ec7ee91c2cc6.png)
+![intro](/assets/eip-1438/intro.png)
 
 ## Specification
 ### 1. Avatar
@@ -38,11 +38,11 @@ The avatar's information & assets are stored in the event log part of the block
 - Assets are SVG format. (compressed with gzip)
 - avatar information data is json (compressed with msgpack)
 
-![avatar](https://user-images.githubusercontent.com/11692220/45530825-820e2300-b827-11e8-8468-fc3a9ae51ed8.png)
+![avatar](/assets/eip-1438/avatar.png)
 ** The avatar assets from [Avataaars](https://github.com/fangpenlin/avataaars) developed by [Fang-Pen Lin](https://twitter.com/fangpenlin), the original avatar is designed by [Pablo Stanley](https://twitter.com/pablostanley).
 
 ### 2. Universal Wallet
-![wallet](https://user-images.githubusercontent.com/11692220/45146088-1b708000-b1fd-11e8-9b57-30ea7491de0b.png)
+![wallet](/assets/eip-1438/wallet.png)
 #### 2.1. ERC20 interface
 ``` js
 contract ERC20Interface {

EIPS/eip-1613.md

@@ -89,7 +89,7 @@ Glossary of terms used in the processes below:
 * `Sender` - an external address with a valid key pair but no ETH to pay for gas.
 * `Relay` - a node holding ETH in an external address, listed in RelayHub and relaying transactions from Senders to RelayHub for a fee.
 
-![Sequence Diagram](https://bit.ly/2WZqM23)
+![Sequence Diagram](/assets/eip-1613/sequence.png)
 
 The process of registering/refreshing a `Relay`:
 

EIPS/eip-2025.md

@@ -70,7 +70,7 @@ FOR BENEFICIARY in BENEFICIARY_ADDRESSES:
 *With a price of Etheruem at $150.00 this will raise approx USD $2,325,000.00 for developing Eth1.X over the next 18 months.*
 
 
-![Block Rewards Distribution](https://docs.google.com/drawings/d/e/2PACX-1vRzpcFXvkftqEduftfCnNeJmjxQAyBjD1RMkuFt0JeURxSZ2oUSGA1HQ1-v5rjGeim2cn8IwF4UFH18/pub?w=873 "Logo Title Text 1") *Specific Addresses to be determined
+![Block Rewards Distribution](/assets/eip-2025/block_rewards_distribution.png) *Specific Addresses to be determined
 
 * [FAQ - Why hardcoded values?]( #why-hardcoded-values )
 
@@ -86,7 +86,7 @@ The Eth1x initiative needs funding now, not in 18 months. A loan is necessary to
 
 ### Loan Repayment
 
-![Loan State Diagram](https://docs.google.com/drawings/d/e/2PACX-1vQrYtGONSu16KncNOjDJrtrbAfBRU1FAgl_2neZjkLiJVxJATAVPiEjKUfVElA9zU7pc-3cCizRgqFn/pub?h=400)
+![Loan State Diagram](/assets/eip-2025/loan_state.png)
 
 There is a risk that the investors lose part of their contribution in the case that this EIP is rejected by the community between the time the funds have been collected and the beginning of the payout schedule. In this case all remaining funds will be returned to the contributors. The interest on the loan is an incentive for investors to participate in spite of this risk. Their downside is limited to the amount of funds spent before this EIP is accepted or rejected, which should be no more than about 5%, while their upside consists of the 10% simple interest paid over the period.