Put documentation images in right folder

doc/Doxyfile

@@ -51,7 +51,7 @@ PROJECT_BRIEF          = "Full experimental OpenSource LTE and NR implementation
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
-PROJECT_LOGO           = @CMAKE_SOURCE_DIR@/doc/oai_logo.png
+PROJECT_LOGO           = @CMAKE_SOURCE_DIR@/doc/images/oai_logo.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is

doc/FEATURE_SET.md

@@ -11,12 +11,12 @@
 -  FAPI (IF2)  : specified by Small Cell Forum (open-nFAPI implementation)
 -  IF1         : F1 in 3GPP Release 15
 
-![Functional Split Architecture](./oai_enb_func_split_arch.png)
+![Functional Split Architecture](./images/oai_enb_func_split_arch.png)
 
 
 # OpenAirInterface Block Diagram #
 
-![Block Diagram](./oai_enb_block_diagram.png)
+![Block Diagram](./images/oai_enb_block_diagram.png)
 
 # OpenAirInterface 5G-NR Feature Set #
 

doc/nr-ue-design.md

@@ -15,7 +15,7 @@ The UE exits when at any point in operation it gets out of synchronization. When
 
 UE uses actors which are threads dedicated to particular activity. Sync Actor handles initial sync. DL Actors handle DLSCH PHY procedures. UL procedures are are run on the UL Actor
 
-![design](nr-ue-threads.svg)
+![design](images/nr-ue-threads.svg)
 
 ## Initial Synchronization Block
 ```mermaid