Fixed documentation (fixed hierarchy). (#51)

* Move gem5 101

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* move checkpoints

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* Move m5ops

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* move extras

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* update cpu models

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* Rename debugging and testing to index

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* Add empty index.md files for each directory

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* Add frontmatter to index.md's

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* move stats to general_docs

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* Delete general_docs index

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

* [EndOfDayCommit] Changes half done.

* Fixed hierarchy in gem5 documentation.

* Fixed broken links, renamed some titles. Cleaned up stuff.

* Fixed links in contributing.md

* Improving "Building EXTRAS" title.

* Moving 'memory_system/ruby' to 'general_docs' directory.

* Added landing page for 'gem5 documentation'.

* Removed unneeded index.md

* Removing done TODO message.

* Fixing links where broken.

* Fixing broken link in Learning gem5 docs.

* Fixing some broken links to assets.
51 files changed