cli: rename existing system from `cli` to `oclif` (#739)

Summary:
Per #580, we aim to remove OClif. To do so, we move the old system to a
directory `oclif`, and will create the new system in the now-vacant
`cli` directory.

Test Plan:
Note that `yarn backend` still builds, that `node bin/sourcecred.js`
still has `help` and `load`, and that `git grep -wc cli` yields only
`yarn.lock:9`.

wchargin-branch: rename-cli-to-oclif

config/paths.js

@@ -27,8 +27,8 @@ module.exports = {
   // source file, and the key will be the filename of the bundled entry
   // point within the build directory.
   backendEntryPoints: {
-    sourcecred: resolveApp("src/cli/sourcecred.js"),
-    "commands/load": resolveApp("src/cli/commands/load.js"),
+    sourcecred: resolveApp("src/oclif/sourcecred.js"),
+    "commands/load": resolveApp("src/oclif/commands/load.js"),
     //
     fetchAndPrintGithubRepo: resolveApp(
       "src/plugins/github/bin/fetchAndPrintGithubRepo.js"

src/app/credExplorer/repoRegistry.js

@@ -1,7 +1,7 @@
 // @flow
 
 // The repoRegistry is written by the CLI load command
-// (src/cli/commands/load.js) and is read by the RepositorySelect component
+// (src/oclif/commands/load.js) and is read by the RepositorySelect component
 // (src/app/credExplorer/RepositorySelect.js)
 import deepEqual from "lodash.isequal";
 import {toCompat, fromCompat, type Compatible} from "../../util/compat";