Add another guide around fixing memory usage.

docs/guides/build-using-too-many-resources.rst

@@ -0,0 +1,25 @@
+My build is using too many resources
+====================================
+
+We limit build resources to make sure that users don't overwhelm our build systems.
+If you are running into this issue,
+there are a couple fixes that you might try.
+
+.. note:: The current build limits can be found on our :doc:`/builds` page.
+
+Reduce formats you're building
+------------------------------
+
+You can change the formats of docs that you're building with our YAML file's :ref:`yaml-config:Formats` option.
+
+In particular, the `htmlzip` takes up a decent amount of memory and time,
+so disabling that format might solve your problem.
+
+Reduce documentation build dependencies
+---------------------------------------
+
+A lot of projects reuse their requirements file for their documentation builds.
+If there are extra packages that you don't need for building docs,
+you can create a custom requirements file just for documentation.
+This should speed up your documentation builds,
+as well as reduce your memory footprint.

package.json

@@ -6,7 +6,8 @@
   "dependencies": {
     "bowser": "^1.9.3",
     "cssfilter": "0.0.8",
-    "github-changelog": "git+https://github.com/agjohnson/github-changelog.git"
+    "github-changelog": "git+https://github.com/agjohnson/github-changelog.git",
+    "npm": "^6.1.0"
   },
   "devDependencies": {
     "bower": "*",