Docs: Add v0.15.3-alpha release notes to master

[ViktorT-11]

This PR cherry-picks 2 commits from #1164 into master as #1164 was merged into a side branch, and adds the v0.15.3-alpha release notes to master.

[gemini-code-assist]

Summary of Changes

Hello @ViktorT-11, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates the release notes for the v0.15.3-alpha version of Lightning Terminal into the master branch. It ensures that the documentation accurately reflects the latest version and its compatibility with various integrated components, including an important update to the loop binary.

Highlights

• Release Notes Added: New release notes for v0.15.3-alpha have been added to the documentation.
• Version Compatibility Updates: The README.md file has been updated to include v0.15.3-alpha in the compatibility tables for Lightning Terminal and its integrated binaries (LND, Loop, Faraday, Pool, Taproot Assets).
• Cherry-picked Changes: Two commits from pull request Prepare for litd v0.15.3-alpha release #1164 have been cherry-picked, specifically updating the loop binary to v0.31.5-beta.

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[gemini-code-assist]

Code Review

This pull request adds the release notes for v0.15.3-alpha and updates the compatibility tables in the README.md. The changes appear to be mostly correct and in line with project conventions. However, there is one potential issue in the new release notes file that will likely cause a CI failure because a required link to the current pull request is missing. My review includes a comment to address this.

[Roasbeef]

LGTM 🛋️

[sputn1ck]

LGTM!