Add comment about flex layout in index.htm

Author: linev

index.htm

@@ -23,16 +23,17 @@
    json      - name of JSON file(s) with ROOT object, stored by TBufferJSON::ConvertToJSON method
    item      - object name(s) in the file to display
    opt       - draw option(s) for the item(s)
-   layout    - can be 'simple', 'collapsible', 'tabs' or gridNxM where N and M are integer values
+   layout    - can be 'simple', 'flex', 'collapsible', 'tabs' or gridNxM where N and M are integer values
    nobrowser - only file item(s) will be displayed, browser will be disabled
    load      - name of JavaScript(s), automatically loaded at the beginning
    mathjax   - use MathJax for Latex output (automatically loaded for TMathText objects)
+   paltte    - id of default color palette, 51..121 - new ROOT6 palette  (default 57)
 
 Example:
    https://root.cern.ch/js/latest/?file=../files/hsimple.root&layout=grid2x2&item=[hpx;1,hpxpy;1]&opts=[,colz]
 
 Page can be used to open files from other web servers like:
-   https://root.cern.ch/js/latest/?file=https://web-docs.gsi.de/~linev/js/files/hsimple.root
+   https://root.cern.ch/js/latest/?file=https://jsroot.gsi.de/files/hsimple.root
 
 But one should be aware about Cross-Origin Request blocking.
 Read https://developer.mozilla.org/en/http_access_control for more details.
@@ -42,6 +43,6 @@
    <script type="text/javascript" src="https://root.cern.ch/js/latest/scripts/JSRootCore.min.js?gui"></script>
 
 If necessary, complete JSROOT can be installed on the web server.
-All sources can be found in $ROOTSYS/etc/http/ directory.
+Project repository: https://github.com/linev/jsroot.
 
 -->