Remove kc705

[sarpadi]

PR Description

KC705 was discontinued by Xilinx, removing support

PR Type

• Bug fix (change that fixes an issue)
• New feature (change that adds new functionality)
• Breaking change (has dependencies in other repos or will cause CI to fail)
• Documentation

PR Checklist

• I have followed the code style guidelines
• I have performed a self-review of changes
• I have compiled all hdl projects and libraries affected by this PR
• I have tested in hardware affected projects, at least on relevant boards
• I have commented my code, at least hard-to-understand parts
• I have signed off all commits from this PR
• I have updated the documentation (wiki pages, ReadMe files, Copyright etc)
• I have not introduced new Warnings/Critical Warnings on compilation
• I have added new hdl testbenches or updated existing ones

[cristianmihaipopa]

Suggested change

	.. admonition:: Legend
	:class: note
	- ``*`` removed; last release that supported the project is
	:git-hdl:`hdl_2023_r2 <hdl_2023_r2:projects/ad9467_fmc/kc705>`
	.. admonition:: Legend
	:class: note
	- ``*`` removed; last release that supports this project on this carrier is
	:git-hdl:`hdl_2023_r2 <hdl_2023_r2:projects/ad9467_fmc/kc705>`

This applies to every occurrence of this phrase.