chore: Remove marketing material from OSS project (#941)

* changes to support Plainhome

* changes to env sample

* changes to env variable names

* formatter fixes

* remove the content pages

* test fix

* lint fixes

* minor fixes

* removed unnesscary routes

* Apply suggestions from code review

Co-Authored-By: Tom Moor <tom.moor@gmail.com>

* removed team name from env

server/routes.test.js

@@ -13,7 +13,7 @@ describe('#index', async () => {
     const res = await server.get('/');
     const html = await res.text();
     expect(res.status).toEqual(200);
-    expect(html.includes('Your team’s knowledge base')).toEqual(true);
+    expect(html.includes('Our team’s knowledge base')).toEqual(true);
   });
 
   it('should render app if there is an accessToken', async () => {