Move `version.js` to core (#977)

Currently version is located in `homepage/`, which doesn't make much
sense, since it's versioning the whole project.

We move it to core.

Test plan: `yarn test --full`

config/env.js

@@ -6,7 +6,7 @@ const path = require("path");
 
 const paths = require("./paths");
 
-/*:: import type {GitState} from "../src/homepage/version"; */
+/*:: import type {GitState} from "../src/core/version"; */
 
 // Make sure that including paths.js after env.js will read .env variables.
 delete require.cache[require.resolve("./paths")];

src/cli/sourcecred.js

@@ -3,7 +3,7 @@
 
 import type {Command} from "./command";
 
-import {VERSION_SHORT} from "../homepage/version";
+import {VERSION_SHORT} from "../core/version";
 
 import help from "./help";
 import load from "./load";

src/core/version.test.js

@@ -9,7 +9,7 @@ import {
   parseGitState,
 } from "./version";
 
-describe("homepage/version", () => {
+describe("core/version", () => {
   const version = (): VersionInfo => ({
     major: 3,
     minor: 13,

src/homepage/Page.js

@@ -11,7 +11,7 @@ import TwitterLogo from "./TwitterLogo";
 import DiscordLogo from "./DiscordLogo";
 import {routeData} from "./routeData";
 import * as NullUtil from "../util/null";
-import {VERSION_SHORT, VERSION_FULL} from "./version";
+import {VERSION_SHORT, VERSION_FULL} from "../core/version";
 
 export default class Page extends React.Component<{|
   +assets: Assets,