Update comments and documents

Author: EXL

ReadMe.md

@@ -14,9 +14,8 @@ Syntax highlighting is implemented using several libraries and languages:
 ![Code Polyglot Pastorg Screenshot](image/CodePolyglot_PastorgSkin_Screenshot.png)
 
 *Live demo: [code.exlmoto.ru](https://code.exlmoto.ru) with Highlight.js and Rouge syntax higlighters.*\
-*Pygments on [GraalPython](https://github.com/oracle/graalpython) are CPU and RAM intensive.*
-
-*Note: Service can sometimes be offline.*
+*Warning: Pygments on [GraalPython](https://github.com/oracle/graalpython) are CPU and RAM intensive and therefore disabled.*\
+*Note: Demo service may not be available.*
 
 ## API examples
 

doc/UsefulTips.md

@@ -1,6 +1,22 @@
 Useful Tips
 ===========
 
+## Find non-ASCII symbols
+
+```shell script
+grep -rP '[^\x00-\x7f]' src/ doc/ util/
+```
+
+This command should be run at the root of the project.
+
+## Find TODO: labels
+
+```shell script
+grep -ri TODO src/ doc/ util/
+```
+
+This command should be run at the root of the project.
+
 ## Find all files without line ending at the end
 
 ```shell script

util/nginx/code.conf

@@ -20,6 +20,9 @@ server {
  proxy_set_header X-Forwarded-Port $server_port;
  }
 
+ # Drop brute-force attack on some paths.
+ # Test:
+ # $ ab -n 100 -c 10 code.exlmoto.ru/api
  location ~ ^/(edit|api|login)$ {
  limit_req zone=one burst=1 nodelay;
  proxy_pass http://localhost:8080/$1$is_args$args;