next 7.0.2-canary.42

Updates version of firebase: #5829
Only check if BUILD_ID exists when reading throws error: #5834
Remove unused functions: #5832
Move serve-static to typescript: #5833
Move getDynamicImportBundles into own ts file: #5836
Added length calculation for insert of cache rather then default to 1…: #5835
Remove unused properties: #5837
Move getPageFiles and convert to ts: #5841
Move sendHTML and rewrite in ts: #5839
Remove app variable as it’s only used once: #5842
Convert next-server.js to typescript: #5844
Improved ant-design with less: #5847
Update for use with Firestore: #5793
Use more recent version of svg plugin: #5788
Fix paths when built on windows: #5795
Update styletron example: #5573
Create with-firebase-hosting-and-docker example: #5373
Added a new example with relay modern and a graphql server with express.: #4670
Docs(readme): add documentation for renderPage customization on _document.js: #5723
Fix linting: 6b7864e57e481efb26e85e2ecb44e98d336be5ec
Use correct default for query: #5851
Make <Head> children render first, then next/head children, then script preloads/styles: #5852
Update/fix "examples/with-firebase-hosting": #5853
Run compilers sequentially when in lambdas mode: #5862

Huge thanks to @JeroenKnoops, @pkellner, @searleb, @moflo, @stahlmanDesign, @oBusk, @illogikal, @sarovin, @dutradda, and @klujanrosas for helping!