Partial site update to 2025

Took just conf.py and guides/index.rst from d585a367c842bddcd757eef3e4f49c1ba4aa82cb

Committed-by: Jason Kridner <jkridner@beagleboard.org>

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Site updated to GSoC_2025 state

Moved GSoC 2024 ideas not implemented to 'old ideas' for future reference

Signed-off-by: Aryan <nandaaryan823@gmail.com>

Moved GSoC 2024 projects to past projects list

Signed-off-by: Aryan <nandaaryan823@gmail.com>

Updated copyright from 2024 to 2025

Signed-off-by: Aryan <nandaaryan823@gmail.com>

Updated timeline according to GSoC2025

Signed-off-by: Aryan <nandaaryan823@gmail.com>

Moved GSoC2024 proposals to archieved folder

Signed-off-by: Aryan <nandaaryan823@gmail.com>

Updated 2024 projects proposals link

Signed-off-by: Aryan <nandaaryan823@gmail.com>

announcement updated

Signed-off-by: Aryan <nandaaryan823@gmail.com>

Demo idea updated

Signed-off-by: Aryan <nandaaryan823@gmail.com>

Links corrected

Signed-off-by: Aryan <nandaaryan823@gmail.com>