Infineon: Add cyw20829 platform, shared slot feature, json memory map, psoc6 xip

Based in 1.8.0 release of MCUBoot library

This commit adds CYW20829 Infineon platform support with following capabilities:
1. Overwrite and swap upgrade mode support
2. Multi-image with up to 4 images
3. Hardware security counter is supported for CYW20829 platform

Add XIP support for PSOC6 platform - place BOOT slot in external memory and execute it in place using SMIF in XIP mode

and some new features for Infineon devices.

1. Shared upgrade slot feature - use one shared area for upgrade slots of multiple images
2. Memory map defined using JSON file - define memory regions for bootloader and user app in conventional way using JSON file
diff --git a/docs/index.md b/docs/index.md
index 5f2cf09..c892c57 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -61,13 +61,13 @@
 
 For more information in the source, here are some pointers:
 
-- [boot/bootutil](https://github.com/mcu-tools/mcuboot/tree/master/boot/bootutil): The core of the bootloader itself.
-- [boot/boot\_serial](https://github.com/mcu-tools/mcuboot/tree/master/boot/boot_serial): Support for serial upgrade within the bootloader itself.
-- [boot/zephyr](https://github.com/mcu-tools/mcuboot/tree/master/boot/zephyr): Port of the bootloader to Zephyr
-- [boot/mynewt](https://github.com/mcu-tools/mcuboot/tree/master/boot/mynewt): Mynewt bootloader app
-- [boot/mbed](https://github.com/mcu-tools/mcuboot/tree/master/boot/mbed): Port of the bootloader to Mbed-OS
-- [imgtool](https://github.com/mcu-tools/mcuboot/tree/master/scripts/imgtool.py): A tool to securely sign firmware images for booting by MCUboot.
-- [sim](https://github.com/mcu-tools/mcuboot/tree/master/sim): A bootloader simulator for testing and regression
+- [boot/bootutil](https://github.com/mcu-tools/mcuboot/tree/main/boot/bootutil): The core of the bootloader itself.
+- [boot/boot\_serial](https://github.com/mcu-tools/mcuboot/tree/main/boot/boot_serial): Support for serial upgrade within the bootloader itself.
+- [boot/zephyr](https://github.com/mcu-tools/mcuboot/tree/main/boot/zephyr): Port of the bootloader to Zephyr
+- [boot/mynewt](https://github.com/mcu-tools/mcuboot/tree/main/boot/mynewt): Mynewt bootloader app
+- [boot/mbed](https://github.com/mcu-tools/mcuboot/tree/main/boot/mbed): Port of the bootloader to Mbed-OS
+- [imgtool](https://github.com/mcu-tools/mcuboot/tree/main/scripts/imgtool.py): A tool to securely sign firmware images for booting by MCUboot.
+- [sim](https://github.com/mcu-tools/mcuboot/tree/main/sim): A bootloader simulator for testing and regression
 
 ## Joining