WIP: Audit migrated posts metadata and filenames

[Copilot]

No repository changes have been made yet. Once updates are applied, this description will be replaced with a summary of the post filename/title normalization and any removals of extra/duplicate migrated entries.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Check migrated older posts</issue_title>
<issue_description>We need to double check the migrated posts in this blog, considering:

• This is a gh-pages hosted jekyll-powered static blog site which was migrated earlier.
• The original posts can be fetched from https://weblogs.asp.net/cazzu?page=1-51 (page range)
• The only exception is the post titled Joining Xamarin from May 28, 2014, which can be fetched from https://web.archive.org/web/20150220042100/http://blogs.clariusconsulting.net/kzu/xamarin/
• We should have no extra entries other than the original. Check by matching first header (title) from markdown files under _posts against the weblogs.asp.net pages' title (ignore the "Daniel Cazzulino's Blog - " prefix). If there are duplicates (either on _posts or weblogs.asp.net), keep only the lastest published version from the latter.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Check migrated older posts #1

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