cramfs: drop obsolete Future Development notes and update tools URL

fs/cramfs/README still carries a "Future Development" section written
around the Linux 2.3.39 era discussing design decisions that have long
since been settled:

  - Block size is 4096 and matches PAGE_SIZE on the reader.
  - Endianness is host-endian; mkcramfs -B / -L handles cross-builds.
  - Block-pointer extensions (CRAMFS_FLAG_EXT_BLOCK_POINTERS) ended up
    being the answer to layout flexibility rather than inode growth.

Drop the stale forward-looking section -- the factual format
description above remains accurate and is kept as-is.

While here, replace the dead sourceforge URL in the "Tools" section
with the current location of the user-space tools on github.

Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260422211039.270552-2-nico@fluxnic.net>

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