Minor doc updates, fixes and improvements

In particular, removed code which no longer worked, made light
theme easier on the eyes, added slight syntax highlightning,
and fixed search for exact matches.

telethon_generator/generators/docs.py

@@ -105,13 +105,14 @@ def _generate_index(root, folder, paths,
     filename = folder / (BOT_INDEX if bots_index else INDEX)
     with DocsWriter(root, filename, _get_path_for_type) as docs:
         # Title should be the current folder name
-        docs.write_head(str(folder).title(),
+        docs.write_head(str(folder).replace(os.path.sep, '/').title(),
                         css_path=paths['css'],
                         default_css=paths['default_css'])
 
         docs.set_menu_separator(paths['arrow'])
         _build_menu(docs)
-        docs.write_title(str(filename.parent.relative_to(root)).title())
+        docs.write_title(str(filename.parent.relative_to(root))
+                         .replace(os.path.sep, '/').title())
 
         if bots_index:
             docs.write_text('These are the methods that you may be able to '
@@ -379,19 +380,18 @@ def _write_html_pages(root, tlobjects, methods, layer, input_res):
                                     '<code>telethon.errors</code>.')
 
                 docs.write_title('Example', id='examples')
-                docs.write(
-                    '<pre>from telethon.sync import TelegramClient\n'
-                    'from telethon import functions, types\n'
-                    '\n'
-                    'with TelegramClient(name, api_id, api_hash) as client:\n'
-                    '    result = client(')
+                docs.write('''<pre>\
+<strong>from</strong> telethon.sync <strong>import</strong> TelegramClient
+<strong>from</strong> telethon <strong>import</strong> functions, types
+
+<strong>with</strong> TelegramClient(name, api_id, api_hash) <strong>as</strong> client:
+    result = client(''')
                 tlobject.as_example(docs, indent=1)
                 docs.write(')\n')
                 if tlobject.result.startswith('Vector'):
-                    docs.write(
-                        '    for x in result:\n'
-                        '        print(x'
-                    )
+                    docs.write('''\
+    <strong>for</strong> x <strong>in</strong> result:
+        print(x''')
                 else:
                     docs.write('    print(result')
                     if tlobject.result != 'Bool' \