Prepare Development section for override in customized docs

[alexv-smirnov]

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❌ Documentation build

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❌ Error occurred in /en/postgresql/functions.md

❌ Error occurred in /en/reference/ydb-cli/workload-kv.md

❌ Error occurred in /ru/postgresql/functions.md

❌ Error occurred in /ru/reference/ydb-cli/workload-kv.md

❌ No such file or has no access to /en/postgresql/functions.md

❌ No such file or has no access to /en/reference/ydb-cli/workload-kv.md

❌ No such file or has no access to /ru/postgresql/functions.md

❌ No such file or has no access to /ru/reference/ydb-cli/workload-kv.md