replace all TechDocsPage -> TechDocsReaderPage and TechDocsPageHeader -> TechDocsReaderPageHeader except in docs

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

plugins/techdocs/src/reader/components/TechDocsReaderPage.test.tsx

@@ -40,10 +40,10 @@ jest.mock('react-router-dom', () => {
   };
 });
 
-jest.mock('./TechDocsPageHeader', () => {
+jest.mock('./TechDocsReaderPageHeader', () => {
   return {
     __esModule: true,
-    TechDocsPageHeader: () => <div />,
+    TechDocsReaderPageHeader: () => <div />,
   };
 });