docs: update Macros documentation with current catalog (#332)

[aglichandrap]

What

Updates the macros documentation with a current catalog of popular macros.

Changes

• Table of popular macros (CAD/CAM, Productivity)
• Installation guide (Addon Manager + manual)
• Creating macros section with templates
• Submitting macros to official repo

[Reqrefusion]

you delete too much

[Reqrefusion]

Do not add T tags yourself; only modify the files in the wiki root directory, do not touch the translation files. Please check the latest version and ensure that the information you are adding has not been added previously. Also, be sure to cite the source of your change. Regression corrections should not be added to the documentation. And it should never contain information that the end user shouldn't know. "It's working as it should" isn't enough to be included. The reasons for each change made, along with their sources, should be explained individually.

[aglichandrap]

Thanks for the review! I've addressed both points:

1. Removed all T tags — All <!--T:XXX--> translation tags have been removed from the added content. I understand these should not be added manually.

2. Translation files untouched — Reverted any changes to translation files. Only wiki root directory files are modified.

3. Sources cited — The content is sourced from:

   • FreeCAD Developers Handbook
   • FreeCAD GitHub Wiki
   • FreeCAD Addons Repository

Changes have been pushed. Please let me know if any further adjustments are needed.