Move `host-config` to `config`

src/sidebar/config/fetch-config.js

 import getApiUrl from './get-api-url';
-import hostConfig from '../host-config';
+import hostConfig from './host-config';
 import * as postMessageJsonRpc from '../util/postmessage-json-rpc';
 
 /**

src/sidebar/host-config.js → src/sidebar/config/host-config.js

@@ -4,9 +4,9 @@ import {
   toInteger,
   toObject,
   toString,
-} from '../shared/type-coercions';
+} from '../../shared/type-coercions';
 
-/** @typedef {import('../types/config').HostConfig} HostConfig */
+/** @typedef {import('../../types/config').HostConfig} HostConfig */
 
 /**
  * Return the app configuration specified by the frame embedding the Hypothesis

src/sidebar/config/test/fetch-config-test.js

@@ -14,7 +14,7 @@ describe('sidebar/config/fetch-config', () => {
     };
     fakeApiUrl = sinon.stub().returns('https://dev.hypothes.is/api/');
     $imports.$mock({
-      '../host-config': fakeHostConfig,
+      './host-config': fakeHostConfig,
       '../util/postmessage-json-rpc': fakeJsonRpc,
       './get-api-url': fakeApiUrl,
     });

src/sidebar/test/host-config-test.js → src/sidebar/config/test/host-config-test.js

@@ -8,7 +8,7 @@ function fakeWindow(config) {
   };
 }
 
-describe('sidebar/host-config', function () {
+describe('sidebar/config/host-config', function () {
   it('parses config from location string and returns whitelisted params', function () {
     const window_ = fakeWindow({
       annotations: '1234',