Wiki: the front page's title says what the site is (#48)

ddiff --git a/server/render/layout.js b/server/render/layout.js
iindex d00ca9f..aa465cd 100644
---- a/server/render/layout.js
++++ b/server/render/layout.js
@@@ -83,7 +83,8 @@ function renderPage(o) {
          site: 'wiki',
          siteName: SITE_NAME,
          lang: 'en',
--        title: o.title ? `${o.title} · ${SITE_NAME}` : SITE_NAME,
++        // The front page's title says what the site is (search results show it); every other page is "<page> · OpenVibe.Wiki".
++        title: o.title ? `${o.title} · ${SITE_NAME}` : o.path === '/' ? `${SITE_NAME}: wiki spaces with history and citations` : SITE_NAME,
          description: o.description || DEFAULT_DESCRIPTION,
          summary: o.summary,
          canonical: `${config.baseUrl}${o.path || '/'}`,
ddiff --git a/test/layout.test.js b/test/layout.test.js
iindex a12e641..3aba777 100644
---- a/test/layout.test.js
++++ b/test/layout.test.js
@@@ -52,7 +52,7 @@ const robotsOf = (head) => /<meta name="robots" content="([^"]*)">/.exec(head)[1
          // The home page: indexable by an explicit robots string, plus the showcase kit's stylesheet.
          r = await H.req(h, 'GET', '/');
          let { head } = frameOf(r.text, '/');
--        assert.ok(head.includes('<title>OpenVibe.Wiki</title>'), 'the home title is the site name');
++        assert.ok(head.includes('<title>OpenVibe.Wiki: wiki spaces with history and citations</title>'), `the home title says what the site is: ${(/<title>[^<]*<\/title>/.exec(head) || [''])[0]}`);
          assert.ok(/<link rel="canonical" href="https?:\/\/[^"\/]+\/">/.test(head), 'the home canonical');
          assert.strictEqual(robotsOf(head), 'index, follow');
          assert.ok(/<link rel="stylesheet" href="\/shared\/[^"]*showcase[^"]*">/.test(head), 'the extra openvibe-shared stylesheet');