Add eslint-plugin-jsx-a11y (#1651)

* Add eslint-plugin-jsx-a11y.

* Fix npm script.

* Adjust npm scripts so test also runs lint.

* Fix existing lint errors.

* Don't break on a11y issues.

* Add role and tabIndex.

* Add vim and Mac files to .gitignore and .dockerignore.

* Handle htmlFor (partially), a that's actually a button.

* Fix missing tabIndex.

* Add cursor:pointer to load-more

* Revert change to load_more.

* Fixes based on review.

* Update yarn.lock.

* Don't try to install fsevents on Linux (hides warning noise).

.gitignore

@@ -29,10 +29,16 @@ neo4j/
 # Ignore Capistrano customizations
 config/deploy/*
 
-
 # Ignore IDE files
 .vscode/
 
 # Ignore postgres + redis volume optionally created by docker-compose
 postgres
 redis
+
+# Ignore Apple files
+.DS_Store
+
+# Ignore vim files
+*~
+*.swp