chore: move run-sift (gatsbyjs#9549)

* Add nodes namespace to support loki feature flag

* naughty console log

* switch for db nodes backend

* move connection out of run-sift

* revert snapshot for gatsby-remark-embed

* typo

* move node tracking into DB

* move run-sift into redux

* use runQuery instead of runSift

* add caching of getNodesByType in run-sift

* fix docs

README.md

@@ -138,12 +138,10 @@ Whether you're helping us fix bugs, improve the docs, or spread the word, we'd l
 
 Check out our [**Contributing Guide**](https://gatsbyjs.org/docs/how-to-contribute/) for ideas on contributing and setup steps for getting our repositories up and running on your local machine.
 
-
 ### Code of Conduct
 
 Gatsby is dedicated to building a welcoming, diverse, safe community. We expect everyone participating in the Gatsby community to abide by our [**Code of Conduct**](https://gatsbyjs.org/docs/code-of-conduct/). Please read it. Please follow it. In the Gatsby community, we work hard to build each other up and create amazing things together. 💪💜
 
-
 ### A note on how this repository is organized
 
 This repository is a [monorepo](https://trunkbaseddevelopment.com/monorepos/) managed using [Lerna](https://github.com/lerna/lerna). This means there are [multiple packages](/packages) managed in this codebase, even though we publish them to NPM as separate packages.

benchmarks/create-pages/README.md

@@ -5,7 +5,9 @@ Stress tests creating lots of tiny pages.
 Defaults to building a site with 5k pages. Set the `NUM_PAGES` environment variable to change that e.g. `NUM_PAGES=25000 gatsby build`
 
 # Running the benchmark
+
 First install node modules required by package.json. This is needed only one time. Then run the build
+
 ```bash
 npm install
 npm run build

benchmarks/markdown/README.md

@@ -5,7 +5,9 @@ Stress tests creating lots of pages rendered from Markdown.
 Defaults to building a site with 5k markdown pages. Set the `NUM_PAGES` environment variable to change that e.g. `NUM_PAGES=25000 gatsby build`
 
 # Running the benchmark
+
 First install node modules required by package.json. This is needed only one time. Then run the build
+
 ```bash
 npm install
 npm run build