Started to move the upgrade from old part-db documentation to gh-pages

docs/upgrade_legacy.md

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+---
+layout: default
+title: Upgrade from legacy Part-DB version (<1.0)
+---
+
+# Upgrade from legacy Part-DB version
+
+Part-DB 1.0 was a complete rewrite of the old Part-DB (< 1.0.0), which you can find [here](https://github.com/Part-DB/Part-DB). A lot of things changed internally, but Part-DB was always developed with compatibility in mind, so you can migrate smoothly to the new Part-DB version, and utilize its new features and improvements.
+
+Some things changed however to the old version and some features are still missing, so be sure to read the following sections carefully before proceeding to upgrade.
+
+## Changes
+* PHP 7.4 or higher is required now (Part-DB 0.5 required PHP 5.4+, Part-DB 0.6 PHP 7.0). 
+  PHP 7.4 (or newer) is shipped by all current major Linux distros now (and can be installed by third party sources on others),
+  Releases are available for Windows too, so almost everybody should be able to use PHP 7.4
+* **Console access highly required.** The installation of composer and frontend dependencies require console access, also more sensitive stuff like database migration work via CLI now, so you should have console access on your server.
+* Markdown/HTML is now used instead of BBCode for rich text in description and command fields.
+ It is possible to migrate your existing BBCode to Markdown via `php bin/console php bin/console partdb:migrations:convert-bbcode`.
+* Server exceptions are not logged to Event log anymore. For security reasons (exceptions can contain sensitive informations)
+ exceptions are only logged to server log (by default under './var/log'), so only the server admins can access it.
+* Profile labels are now saved in Database (before they were saved in a seperate JSON file). **The profiles of legacy Part-DB versions can not be imported into new Part-DB 1.0**
+* Label placeholders now use the `[[PLACEHOLDER]]` format instead of `%PLACEHOLDER%`. Also some placeholders has changed.
+* Configuration is now done via configuration files / environment variables instead of the WebUI (this maybe change in the future).
+* Database updated are now done via console instead of the WebUI
+
+## Missing features
+* No possibility to mark parts for ordering (yet)
+* No import / export possibility for parts (yet), however you can import/export other datastructures like Categories, Footprints, etc.
+* No support for 3D models of footprints (yet)
+
+
+## Upgrade process
+ 1. Upgrade your existing Part-DB version the newest Part-DB 0.5.* version (in the moment Part-DB 0.5.8), like 
+ described in the old Part-DB's repository.
+ 2. Make a backup of your database. If somethings goes wrong during migration, you can use this backup to start over.
+ 3. Setup the new Part-DB like described on [README](README.md) in section Installation. In `.env.local` enter the URL
+ to your old Part-DB database.
+ 4. Run `php bin/console partdb:migrations:convert-bbcode` to convert the BBCode used in comments and part description to the newly used markdown.
+ 5. Copy the content of `data/media` from the old Part-DB version into `public/media` in the new version.
+ 6. Run 'php bin/console cache:clear'
+
+You should now be able to access Part-DB and log in using your old credentials. 
+
+**It is not possible to access the database using the old Part-DB version. 
+If you do so, this could damage your database.** Therefore it is recommended to remove the old Part-DB version.