[Keyboard] Add support for Southpaw Extended 65% (#8465)
* Add support for Southpaw Extended 65%
* Update keyboards/switchplate/southpaw_65/readme.md
* Update keyboards/switchplate/southpaw_65/readme.md
* Update keyboards/switchplate/southpaw_65/readme.md
* Update keyboards/switchplate/southpaw_65/southpaw_65.c
* Update keyboards/switchplate/southpaw_65/rules.mk
* Cleaned up keymaps
-Removed default2 keymap
-Removed default_iso2 keymap
-Rename default keymap directory to default_ansi to reflect correct keymap name
* Update readme.md for default_ansi keymap directory change
* Add layout_all for configurator and correct maximum number of keys supported in readme.md
* Update keyboards/switchplate/southpaw_65/info.json
Forgot to change name to LAYOUT_all
* Update keyboards/switchplate/southpaw_65/info.json
* Update keyboards/switchplate/southpaw_65/readme.md
* Update keyboards/switchplate/southpaw_65/rules.mk
* Add LAYOUT_all keymap
* Update keyboards/switchplate/southpaw_65/keymaps/default/keymap.c
* Update keyboards/switchplate/southpaw_65/info.json
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