better presentation

docs/gazette.md

@@ -1,13 +1,6 @@
 # Gazette
 
-```js echo
-import { DuckDBClient } from "npm:@observablehq/duckdb";
-const db = DuckDBClient.of({ presse: FileAttachment("data/presse.parquet") });
-```
-
-This page allows you to explore the 3 million newspapers by title. I called it “Gazette” because I was surprised that most of the corpus in the earlier years had a title containing this word.
-
-Type in words such as “jeune”, “révolution”, “république”, “matin”, “soir”, “humanité”, “nouvelle”, “moderne”, “femme”, “paysan”, “ouvrier”, “social”, “résistance” etc. to see different historical trends.
+Explore 3 million newspapers **by title**. Type in words such as “jeune”, “révolution”, “république”, “matin”, “soir”, “humanité”, “nouvelle”, “moderne”, “femme”, “paysan”, “ouvrier”, “social”, “résistance” etc. to see different historical trends.
 
 ```js
 const search = view(
@@ -23,6 +16,7 @@ label: `Share of titles matching ${search}`,
 tickFormat: "%",
 },
 marks: [
+Plot.ruleY([0, 0.01], {stroke: ["currentColor"]}),
 Plot.areaY(base, {
 x: "year",
 y: ({year, total}) => gazette.get(year) / total,
@@ -38,7 +32,7 @@ curve: "step"
 })
 }
 
-The query uses a case-insensitive [REGEXP_MATCHES](https://duckdb.org/docs/archive/0.9.2/sql/functions/patternmatching) operator to count occurrences; you can query for example “socialis[tm]e” to match both “socialiste” and “socialisme”.
+I called this page “Gazette” because I was surprised that most of the corpus in the earlier years had a title containing this word. The query uses a case-insensitive [REGEXP_MATCHES](https://duckdb.org/docs/archive/0.9.2/sql/functions/patternmatching) operator to count occurrences; you can query for example “socialis[tm]e” to match both “socialiste” and “socialisme”.
 
 ```js echo
 const results = db.query(
@@ -51,6 +45,11 @@ const results = db.query(
 );
 ```
 
+```js
+import { DuckDBClient } from "npm:@observablehq/duckdb";
+const db = DuckDBClient.of({ presse: FileAttachment("data/presse.parquet") });
+```
+
 ```js
 // A Map for fast retrieval—precisely an InternMap, indexed by Date
 const gazette = new d3.InternMap(results.map(({ year, c }) => [year, c]));