Improve metadata in app definitions (#452)

* Improve metadata in app definitions

* Fix tests

Author: cbovis

src/apps/definitions/0x-api.json

@@ -1,7 +1,8 @@
 {
   "id": "052b4862-2142-4532-bdc0-416814b0a5fe",
   "name": "0x API",
-  "logoUrl": "https://resources.0xtracker.com/logos/0x.png",
+  "description": "Built by the 0x core team – 0x API makes accessing DEX liquidity easy through the use of smart order routing which aggregates liquidity from 0x Mesh, Kyber, Uniswap, and more.",
+  "logo": "0x-api.png",
   "urlSlug": "0x-api",
   "websiteUrl": "https://0x.org/api",
   "mappings": [

src/apps/definitions/1inch-exchange.json

@@ -1,7 +1,8 @@
 {
   "id": "8fc6beb5-3019-45f7-a55a-9a4c6b4b6513",
   "name": "1inch Exchange",
-  "logoUrl": "https://resources.0xtracker.com/logos/1inch-exchange.png",
+  "description": "1inch Exchange is a popular DEX aggregator which sources liquidity from 0x protocol in addition to relaying limit orders.",
+  "logo": "1inch-exchange.png",
   "urlSlug": "1inch-exchange",
   "websiteUrl": "https://1inch.exchange",
   "mappings": [

src/apps/definitions/defi-saver.json

@@ -1,7 +1,8 @@
 {
   "id": "b986d2ba-77bf-420b-99e3-28e592d476e2",
   "name": "DeFi Saver",
-  "logoUrl": "https://resources.0xtracker.com/logos/defi-saver.png",
+  "description": "DeFi Saver is a crypto-portfolio manager which sources liquidity from the 0x ecosystem.",
+  "logo": "defi-saver.png",
   "urlSlug": "defi-saver",
   "websiteUrl": "https://defisaver.com/",
   "mappings": [

src/apps/definitions/matcha.json

@@ -1,7 +1,8 @@
 {
   "id": "5067df8b-f9cd-4a34-aee1-38d607100145",
   "name": "Matcha",
-  "logoUrl": "https://resources.0xtracker.com/logos/matcha.png",
+  "description": "Built by the 0x core team – Matcha is a DEX aggregator built on top of 0x API which allows users to easily swap tokens and place limit orders.",
+  "logo": "matcha.png",
   "urlSlug": "matcha",
   "websiteUrl": "https://matcha.xyz",
   "mappings": [

src/apps/definitions/paraswap.json

@@ -1,7 +1,8 @@
 {
   "id": "4c3854b7-95c3-4714-83ab-a8ed53d2967e",
   "name": "Paraswap",
-  "logoUrl": "https://resources.0xtracker.com/logos/paraswap.png",
+  "description": "Paraswap is a DEX aggregator which sources liquidity from various DEX protocols (including 0x) to offer users better prices.",
+  "logo": "paraswap.png",
   "urlSlug": "paraswap",
   "websiteUrl": "https://paraswap.io",
   "mappings": [