docs: cleanup the Wiki and add missing docs

* Add fxFlexAlign, fxFlexFill, fxFlexOffset, and fxFlexOrder docs
* Refactor references from Angular Material 1.x to AngularJS Material
* Update build instructions to latest changes in build config
* Fix sidebar styling issue

Author: CaerusKaru

CODE_REVIEWS.md

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+# Code reviews for Angular Flex Layout
+
+* Before any coding begins on new, large, or breaking work, a design discussion should take place.
+* All code changes require a review and approval.
+* All behaviors should be covered by unit tests in the same PR.
+* Large changes should be accompanied by corresponding e2e tests in the same PR. 
+* Authors should attempt to keep PRs to 200 - 300 line changes.
+ 
+## Workflow
+1. The code author sends a PR for review. This request should include:
+  * A mention of the intended reviewer(s) (e.g., `@ThomasBurleson`)
+  * A high-level description of the change being made.
+  * Links to any relevant issues.
+  * Screenshots (for visual changes or new additions)
+2. Reviews provide comments and the author responds / makes changes. Repeat until LGTM.
+3. One or more of the reviewers applies the "LGTM" label.
+4. Once the LGTM label is applied, either the author or the reviewer can add the "merge-ready"
+   label to indicate that the PR is ready to be merged.
+5. The party responsible for merging PRs will do so.
+
+## How PRs are merged
+The team has a weekly rotation for the "caretaker" who is responsible for merging PRs. Before being
+merged, the caretaker runs PRs through Google's internal presubmit system. This process helps
+greatly in keeping the library stable by running against the tests of many applications inside of
+Google. Due to the volume of tests involved, this process means that there can be some delay
+between a PR being approved and it being merged.
+
+The "merge safe" label means that the change doesn't affect the library itself (or the demo-app),
+and thus can be merged without this extra presubmit.
+
+The "presubmit failure" label means that the PR has encountered some failure during presubmit and
+needs further investigation by the team.