Remove/replace H1 elements in article body

[cmilesb]

DOC-3962

H1 elements that are not the article's title break our search and copilot. I went in and got as many as I could find.

[github-actions[bot]]

Staging links:
https://redis.io/docs/staging/DOC-3962/commands/expire/
https://redis.io/docs/staging/DOC-3962/develop/data-types/json/developer
https://redis.io/docs/staging/DOC-3962/develop/data-types/probabilistic/bloom-filter
https://redis.io/docs/staging/DOC-3962/develop/data-types/probabilistic/count-min-sketch
https://redis.io/docs/staging/DOC-3962/develop/data-types/probabilistic/cuckoo-filter
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/administration/design
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/administration/extensions
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/administration/gc
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/administration/overview
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/chinese
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/highlight
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/phonetic_matching
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/scoring
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/sorting
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/spellcheck
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/stemming
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/stopwords
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/advanced-concepts/synonyms
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/deprecated/development
https://redis.io/docs/staging/DOC-3962/develop/interact/search-and-query/deprecated/payloads
https://redis.io/docs/staging/DOC-3962/develop/reference/modules/
https://redis.io/docs/staging/DOC-3962/integrate/redis-data-integration/write-behind/installation/install-redis-gears
https://redis.io/docs/staging/DOC-3962/integrate/redis-data-integration/write-behind/reference/config-yaml-reference
https://redis.io/docs/staging/DOC-3962/operate/oss_and_stack/management/optimization/benchmarks/
https://redis.io/docs/staging/DOC-3962/operate/oss_and_stack/reference/internals/rdd
https://redis.io/docs/staging/DOC-3962/operate/oss_and_stack/stack-with-enterprise/deprecated-features/triggers-and-functions/Configuration
https://redis.io/docs/staging/DOC-3962/operate/redisinsight/proxy