Updated links to PVRVFrame and Documentation.

Updated gh-pages SDK browser to 3.5

Removed duplicate README.md (please refer to the default branch README). Updated index.html to link to the SDB Browser documentation

Release notes:

# Builds #
* Added support for Android arm64-v8a, x86_64 and mips64.

# Examples #
* PVRScopeExample and PVRScopeRemote: updated for PVRScope changes.
* PVRScopeExample: CPVRScopeGraph::SetActiveGroup() now accepts a group number even if there are no counters in that group, if there are higher groups. This allows PVRScopeExample to pass an empty group, to reach a higher, populated group number. Allows for ‘invalid’ group numbers – i.e. SW counters.
* PVRScopeRemote:
** Make use of PVRScopeComms new support for nested begin/ends.
** Utilise the CPPLProcessingScoped helper class where appropriate.
** Use the optional pplWaitForConnection() function.
** Instrumented all remaining functions in the app (LoadTextures, LoadShaders, LoadVbos), using CPPLProcessingScoped. Also made use of the __FUNCTION__ define.
* OGLES3ProceduralTextures: corrected input flags for glMemoryBarrier.

# PVRShell #
* CPVRTPrint3D: Fixed out-of-bounds access.

# PVRTools #
* CPVRTPFXEffect: Fixed the Destroy() function to destroy the texture data.
* Fixed a bug in the implementation of PVRTMap where calling ‘Remove’ might have incorrect behaviour.