Use Elasticsearch index aliases to avoid search downtime (mdn#3409)

* Use ElasticSearch index aliases to avoid search downtime

Fixes mdn#3098

* Use ElasticSearch index aliases to avoid search downtime

Part of mdn#3098

(the reason this PR doesn't close issue mdn#3098) is because the `prod-build.yml` still uses `--update`)

* flake8

* Apply suggestions from code review

Co-authored-by: Ryan Johnson <[email protected]>

* remove 'already'

* feedbacked

* cleaning up

* cope with --update the first time ever

* Apply suggestions from code review

Co-authored-by: Ryan Johnson <[email protected]>

* feedbacked

Co-authored-by: Ryan Johnson <[email protected]>

don't double-encode the query string when redirecting (mdn#3502)

Fixes mdn#3425

chore: bump Storybook deps (mdn#3398)

* chore: bump Storybook deps

* chore: pin babel-loader for create-react-app

force-lowercase all H4 IDs in post-processing (mdn#3497)

* force-lowercase all H4 IDs in post-processing

Fixes mdn#3429

* apply for h5 and h6 headings too

Intention to measure: Find out the x-cache values in site-searches (m…

…dn#3421)

Part of mdn#3420

make all front-matter available in KS rendering (mdn#3503)

* make all front-matter available in KS rendering

Fixes mdn#3258

* better error handling in case it's falsy

/en-US/ isn't a broken link (mdn#3507)

Fixes mdn#3326
Fixes mdn#3447

Treat BCD ranges as exact versions to avoid confusion for the reader (m…

…dn#3494)

* Treat BCD ranges as exact versions to avoid confusion for the reader

* Update client/src/document/ingredients/browser-compatibility-table/feature-row.tsx

Co-authored-by: Peter Bengtsson <[email protected]>

Co-authored-by: Peter Bengtsson <[email protected]>

fix kumascript test svginfo.test.js (mdn#3504)

Fix SVG <text> “Permitted content” (mdn#3456)

Per https://svgwg.org/svg2-draft/text.html#elementdef-text the permitted
content for the SVG <text> element includes “text content child
elements” — not “text content elements” (which is something different).

Fixes mdn/content#3882

This change also makes a change to the svginfo macro to cause it to use
all-lowercase for the link anchors it generates (rather than initial cap).