fix: search for C++

[dmijatovic]

Fix search on software, project and organisation page

Changes proposed in this pull request:

• encode search param to allow use of "reserved" characters like +, { and others  

How to test:

• make start to build and generate test data.
• try searching for C++, C%% on software overview page. The url param should be encoded and C++ should be visible in search box.
• try searching for C++ on project overview page. The url param should be encoded and C++ should be visible in search box.
• try searching for C++ on organisation page. The url param should be encoded and C++ should be visible in search box.

Example C++ search for software

PR Checklist:

• Increase version numbers in docker-compose.yml
• Link to a GitHub issue
• Update documentation
• Tests

[ewan-escience]

Works mostly well, but not when you search for a percent sign (%). Maybe it works when you also quote "" the search term (before encoding)...

[sonarcloud]

Quality Gate passed for 'rsd-frontend'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
61.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud