Fix LICENSE link and restore anchor

- Copy LICENSE to docs/ directory for documentation
- Fix LICENSE link in index.md (remove ../ prefix)
- Restore manual anchor {#first-tracker} in First Tracker section

Note: Anchor warning may persist in strict mode due to MkDocs validation timing

Author: Geekgineer

docs/LICENSE

@@ -0,0 +1,21 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+Copyright (C) 2026 motcpp contributors
+https://github.com/motcpp/motcpp
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published
+by the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+For the complete AGPL-3.0 license text, see:
+https://www.gnu.org/licenses/agpl-3.0.txt

docs/guides/getting-started.md

@@ -89,7 +89,7 @@ cmake -B build \
     -DMOTCPP_ENABLE_ONNX=ON
 ```
 
-## First Tracker {#first-tracker}
+## First Tracker
 
 Here's a minimal example to get you started:
 

docs/index.md

@@ -65,7 +65,7 @@ int main() {
 
 ## License
 
-motcpp is licensed under the [GNU Affero General Public License v3.0](../LICENSE).
+motcpp is licensed under the [GNU Affero General Public License v3.0](LICENSE).
 
 ## Citation