update mkdocs to new format, change favicon and delete unused pages (#92)

Signed-off-by: R4SAS <r4sas@i2pmail.org>

docs/devs/building/index.md

@@ -1,15 +0,0 @@
-Build requirements
-==================
-
-In general, for building i2pd you need several things:
-
-* compiler with c++11 support (for example: gcc >= 4.7, clang)
-* boost >= 1.49
-* openssl library
-* zlib library (openssl already depends on it)
-
-Optional tools:
-
-* cmake >= 2.8 (or 3.3+ if you want to use precompiled headers on windows)
-* miniupnp library (for upnp support)
-* [websocketpp](https://github.com/zaphoyd/websocketpp/) (for websocket ui)