[web] Add deprecation notice

[LEDE Commits]

jow pushed a commit to web.git, branch master:
https://git.lede-project.org/b281c4406b68cfb578df45e888bcd6cf7c8811ea

commit b281c4406b68cfb578df45e888bcd6cf7c8811ea
Author: Jo-Philipp Wich <jo at mein.io>
AuthorDate: Tue Jan 3 15:38:00 2017 +0100

    Add deprecation notice
    
    Signed-off-by: Jo-Philipp Wich <jo at mein.io>
---
 README | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/README b/README
index 1b8a9c7..923c4e2 100644
--- a/README
+++ b/README
@@ -1,3 +1,10 @@
+This is the repository of the old LEDE web presence.
+
+The files in here mostly serve historical interest, the actual web
+presence is maintained in the wiki nowadays.
+
+--
+
 This is the repository of the LEDE web pages.
 
 All pages should follow these rules