Removed old PHP code, migrated to Python and Flask

Update .dockerignore, .env, and 503 more files...

data/strings/en/excel-password-remover.yml

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+# EN - Excel Password Remover
+
+meta.title: Excel Worksheet Password Remover
+meta.description: >-
+  Small web page from which you can easily remove a password from an Excel
+  worksheet.  It works by leaving the task of editing the XML files on an Excel
+  document to your browser instead to keep everything local.
+article.subtitle: >-
+  <a
+  href="https://github.com/aziascreations/Excel-Worksheet-Password-Remover"><i
+  class="fab fa-github"></i> View on GitHub</a>
+intro.title: Introduction
+intro.p1: >-
+  This project aims to simplify the removal of passwords on Excel's Worksheet by
+  leaving the task of editing the XML files on an Excel document to your
+  browser.
+working.title: Security & Internal workings
+working.p1: >-
+  In terms of security, your browser handles all the data without sending any of
+  it to a central server like many web apps do.<br>This makes it, and your data,
+  as safe as your browser can be since it is the only potential point of failure
+  here.
+working.p2: >-
+  As for the internal workings, the only thing this tool does is extract the
+  content of the <code>.xlsx</code> file you gave it and removes the passwords
+  on any worksheets and makes a new file with all the changes.<br>Once all of
+  that is done, the file is downloaded via a <a
+  href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs">data
+  URL</a>.
+usage.title: Usage
+usage.p1: >-
+  To use this tool you can either visit "<a
+  href="https://aziascreations.github.io/Excel-Worksheet-Password-Remover">aziascreations.github.io/Excel-Worksheet-Password-Remover</a>"
+  or download the repository and host the web page yourself.
+demo.title: Demonstration video
+links.title: Links
+content.link.demo: Demo hosted on GitHub