docs: fix dead and corrupted resource links (#10400)

Fixes 20 resource links across roadmaps:
- Repair corrupted/truncated URLs (trailing junk, missing slashes,
  wrong slugs): vscode, goperf, laminar, pkg.go.dev/std, pandas query,
  Scala Days YouTube, CircleCI discuss, JUnit, PostgreSQL DBA roadmap
- Update moved official docs: Elixir processes guide (hexdocs),
  Kotlin Flow, Cloudflare Calls, Infura, TestNG
- Remove dead daily.dev tag feed links (pages no longer exist)
- Unlink the username.github.io placeholder in the GitHub Pages intro

All replacement URLs verified to resolve (HTTP 200).

Co-authored-by: Weijian He <230282609+Madin-H23@users.noreply.github.com>

roadmaps/python-data-analysis/content/filtering--querying@wxO7f8wh6JTXHYDiPcbmy.md

@@ -4,7 +4,7 @@ Filtering in Pandas selects rows that meet specified conditions. Boolean masks,
 
 Visit the following resources to learn more:
 
-- [@official@pandas.DataFrame.query](https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.query.htmlme.query)
+- [@official@pandas.DataFrame.query](https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.query.html)
 - [@official@How do I select a subset of a DataFrame?](https://pandas.pydata.org/docs/getting_started/intro_tutorials/03_subset_data.html)
 - [@article@10 Elegant Ways to Filter Pandas DataFrames](https://towardsdatascience.com/stop-writing-messy-boolean-masks-10-elegant-ways-to-filter-pandas-dataframes/)
 - [@video@Filtering Columns and Rows in Pandas](https://www.youtube.com/watch?v=kB7FV-ijdqE)